#line 1 "No_95_Alice_and_Graph.cpp"
#define YRSD
#line 2 "YRS/all.hpp"

#line 2 "YRS/aa/head.hpp"

#include <iostream>
#include <algorithm>

#include <array>
#include <bitset>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <string>
#include <tuple>

#include <bit>
#include <chrono>
#include <functional>
#include <iomanip>
#include <utility>
#include <type_traits>
#include <cassert>
#include <cctype>
#include <cmath>
#include <cstring>
#include <ctime>
#include <limits>
#include <ranges>
#include <concepts>

#define TE template <typename T>
#define TES template <typename T, typename ...S>
#define Z auto
#define ep emplace_back
#define eb emplace
#define fi first
#define se second
#define all(x) (x).begin(), (x).end()

#define OV4(a, b, c, d, e, ...) e
#define FOR1(a) for (int _ = 0; _ < (a); ++_)
#define FOR2(i, a) for (int i = 0; i < (a); ++i)
#define FOR3(i, a, b) for (int i = (a); i < (b); ++i)
#define FOR4(i, a, b, c) for (int i = (a); i < (b); i += (c))
#define FOR(...) OV4(__VA_ARGS__, FOR4, FOR3, FOR2, FOR1)(__VA_ARGS__)
#define FOR1_R(a) for (int _ = (a) - 1; _ >= 0; --_)
#define FOR2_R(i, a) for (int i = (a) - 1; i >= 0; --i)
#define FOR3_R(i, a, b) for (int i = (b) - 1; i >= (a); --i)
#define FOR4_R(i, a, b, c) for (int i = (b) - 1; i >= (a); i -= (c))
#define FOR_R(...) OV4(__VA_ARGS__, FOR4_R, FOR3_R, FOR2_R, FOR1_R)(__VA_ARGS__)
#define FOR_subset(t, s) for (int t = (s); t > -1; t = (t == 0 ? -1 : (t - 1) & s))

#define sort ranges::sort

using namespace std;

TE using vc = vector<T>;
TE using vvc = vc<vc<T>>;
TE using T1 = tuple<T>;
TE using T2 = tuple<T, T>;
TE using T3 = tuple<T, T, T>;
TE using T4 = tuple<T, T, T, T>;
TE using max_heap = priority_queue<T>;
TE using min_heap = priority_queue<T, vc<T>, greater<T>>;
using u8 = unsigned char; using uint = unsigned int; using ll = long long;      using ull = unsigned long long;
using ld = long double;   using i128 = __int128;     using u128 = __uint128_t;  using f128 = __float128;
using u16 = uint16_t;
using PII = pair<int, int>;   using PLL = pair<ll, ll>;

#ifdef YRSD
constexpr bool dbg = 1;
#else
constexpr bool dbg = 0;
#endif
#line 2 "YRS/IO/IO.hpp"

istream &operator>>(istream &I, i128 &x) {
  static string s;
  I >> s;
  int f = s[0] == '-';
  x = 0;
  const int N = (int)s.size();
  FOR(i, f, N) x = x * 10 + s[i] - '0';
  if (f) x = -x;
  return I;
}
ostream &operator<<(ostream &O, i128 x) {
  static string s;
  s.clear();
  bool f = x < 0;
  if (f) x = -x;
  while (x) s += '0' + x % 10, x /= 10;
  if (s.empty()) s += '0';
  if (f) s += '-';
  reverse(all(s));
  return O << s;
}
istream &operator>>(istream &I, f128 &x) {
  static string s;
  I >> s, x = stold(s);
  return I;
}
ostream &operator<<(ostream &O, const f128 x) { return O << ld(x); }
template <typename... S>
istream &operator>>(istream &I, tuple<S...> &t) {
  return apply([&I](Z &...s) { ((I >> s), ...); }, t), I;
}
template <typename T, typename U>
istream &operator>>(istream &I, pair<T, U> &x) {
  return I >> x.fi >> x.se;
}
template <typename T, typename U>
ostream &operator<<(ostream &O, const pair<T, U> &x) {
  return O << x.fi << ' ' << x.se;
}
TE requires requires(T &c) { begin(c); end(c); } and 
                          (not is_same_v<decay_t<T>, string>)
istream &operator>>(istream &I, T &c) {
  for (Z &e : c) I >> e;
  return I;
}
TE requires requires(const T &c) { begin(c); end(c); } and 
  (not is_same_v<decay_t<T>, const char*>) and 
  (not is_same_v<decay_t<T>, string>) and 
  (not is_array_v<remove_reference_t<T>> or 
   not is_same_v<remove_extent_t<remove_reference_t<T>>, char>)
ostream &operator<<(ostream &O, const T &a) {
  if (a.empty()) return O;
  Z i = a.begin();
  O << *i++;
  for (; i != a.end(); ++i) O << ' ' << *i;
  return O;
}
void IN() {}
TE void IN(T &x, Z &...s) { cin >> x, IN(s...); }
void print() { cout << '\n'; }
TES void print(T &&x, S &&...y) {
  cout << x;
  if constexpr (sizeof...(S)) cout << ' ';
  print(forward<S>(y)...);
}
void put() { cout << ' '; }
TES void put(T &&x, S &&...y) {
  cout << x;
  if constexpr (sizeof...(S)) cout << ' ';
  put(forward<S>(y)...);
}

#define INT(...)  int    __VA_ARGS__; IN(__VA_ARGS__)
#define UINT(...) uint   __VA_ARGS__; IN(__VA_ARGS__)
#define LL(...)   ll     __VA_ARGS__; IN(__VA_ARGS__)
#define ULL(...)  ull    __VA_ARGS__; IN(__VA_ARGS__)
#define I128(...) i128   __VA_ARGS__; IN(__VA_ARGS__)
#define STR(...)  string __VA_ARGS__; IN(__VA_ARGS__)
#define CH(...)   char   __VA_ARGS__; IN(__VA_ARGS__)
#define REAL(...) re     __VA_ARGS__; IN(__VA_ARGS__)
#define VEC(T, a, n) vc<T> a(n); IN(a)

void YES(bool o = 1) { print(o ? "YES" : "NO"); }
void Yes(bool o = 1) { print(o ? "Yes" : "No"); }
void yes(bool o = 1) { print(o ? "yes" : "no"); }
void NO(bool o = 1) { YES(not o); }
void No(bool o = 1) { Yes(not o); }
void no(bool o = 1) { yes(not o); }
void ALICE(bool o = 1) { print(o ? "ALICE" : "BOB"); }
void Alice(bool o = 1) { print(o ? "Alice" : "Bob"); }
void alice(bool o = 1) { print(o ? "alice" : "bob"); }
void BOB(bool o = 1) { ALICE(not o); }
void Bob(bool o = 1) { Alice(not o); }
void bob(bool o = 1) { alice(not o); }
void POSSIBLE(bool o = 1) { print(o ? "POSSIBLE" : "IMPOSSIBLE"); }
void Possible(bool o = 1) { print(o ? "Possible" : "Impossible"); }
void possible(bool o = 1) { print(o ? "possible" : "impossible"); }
void IMPOSSIBLE(bool o = 1) { POSSIBLE(not o); }
void Impossible(bool o = 1) { Possible(not o); }
void impossible(bool o = 1) { possible(not o); }
void TAK(bool o = 1) { print(o ? "TAK" : "NIE"); }
void NIE(bool o = 1) { TAK(not o); }
#line 5 "YRS/all.hpp"

#if (__cplusplus >= 202002L)
#include <numbers>
constexpr ld pi = numbers::pi;
#endif
TE constexpr T inf = numeric_limits<T>::max();
template <> constexpr i128 inf<i128> = i128(inf<ll>) * 2'000'000'000'000'000'000;
template <typename T, typename U>
constexpr pair<T, U> inf<pair<T, U>> = {inf<T>, inf<U>};

TE constexpr static inline int pc(T x) { return popcount(make_unsigned_t<T>(x)); }
constexpr static inline ll len(const Z &a) { return a.size(); }

void reverse(Z &a) { reverse(all(a)); }

void unique(Z &a) {
  sort(a);
  a.erase(unique(all(a)), a.end());
}
TE vc<int> inverse(const vc<T> &a) {
  int N = len(a);
  vc<int> b(N, -1);
  FOR(i, N) if (a[i] != -1) b[a[i]] = i;
  return b;
}

Z QMAX(const Z &a) { return *max_element(all(a)); }
Z QMIN(const Z &a) { return *min_element(all(a)); }
constexpr bool chmax(Z &a, const Z &b) { return (a < b ? a = b, 1 : 0); }
constexpr bool chmin(Z &a, const Z &b) { return (a > b ? a = b, 1 : 0); }

vc<int> argsort(const Z &a) {
  vc<int> I(len(a));
  iota(all(I), 0);
  sort(I, [&](int i, int k) { return a[i] < a[k] or (a[i] == a[k] and i < k); });
  return I;
}
TE vc<T> rearrange(const vc<T> &a, const vc<int> &I) {
  int N = len(I);
  vc<T> b(N);
  FOR(i, N) b[i] = a[I[i]];
  return b;
}
template <int of = 1, typename T> 
vc<T> pre_sum(const vc<T> &a) {
  int N = len(a);
  vc<T> c(N + 1);
  FOR(i, N) c[i + 1] = c[i] + a[i];
  if (of == 0) c.erase(c.begin());
  return c;
}

TE constexpr static int topbit(T x) {
  if (x == 0) return - 1;
  if constexpr (sizeof(T) <= 4) return 31 - __builtin_clz(x);
  else return 63 - __builtin_clzll(x);
}
TE constexpr static int lowbit(T x) {
  if (x == 0) return -1;
  if constexpr (sizeof(T) <= 4) return __builtin_ctz(x);
  else return __builtin_ctzll(x);
}

TE constexpr T floor(T x, T y) { return x / y - (x % y and (x ^ y) < 0); }
TE constexpr T ceil(T x, T y) { return floor(x + y - 1, y); }
TE constexpr T bmod(T x, T y) { return x - floor(x, y) * y; }
TE constexpr pair<T, T> divmod(T x, T y) {
  T q = floor(x, y);
  return pair{q, x - q * y};
}
template <typename T = ll>
T SUM(const Z &v) {
  return accumulate(all(v), T(0));
}
int lb(const Z &a, Z x) { return lower_bound(all(a), x) - a.begin(); }
int lb(Z l, Z r, Z x) requires(is_same_v<decltype(l), decltype(r)>) { return lower_bound(l, r, x) - l; }
int ub(const Z &a, Z x) { return upper_bound(all(a), x) - a.begin(); }
int ub(Z l, Z r, Z x) requires(is_same_v<decltype(l), decltype(r)>) { return upper_bound(l, r, x) - l; }

template <bool ck = 1>
ll bina(Z f, ll l, ll r) {
  if constexpr (ck) assert(f(l));
  while (abs(l - r) > 1) {
    ll x = (r + l) >> 1;
    (f(x) ? l : r) = x;
  }
  return l;
}
TE T bina_real(Z f, T l, T r, int c = 100) {
  while (c--) {
    T x = (l + r) / 2;
    (f(x) ? l : r) = x;
  }
  return (l + r) / 2;
}

Z pop(Z &s) {
  if constexpr (requires { s.pop_back(); }) {
    Z x = s.back();
    return s.pop_back(), x;
  } else if constexpr (requires { s.top(); }) {
    Z x = s.top();
    return s.pop(), x;
  } else {
    Z x = s.front();
    return s.pop(), x;
  }
}
void setp(int x) { cout << fixed << setprecision(x); }

TE inline void sh(vc<T> &a, int N) {
  a.resize(N, T(0));
}
#line 1 "YRS/debug.hpp"
#ifdef YRSD
void DBG() { cerr << "]" << endl; }
TES void DBG(T &&x, S &&...y) {
  cerr << x;
  if constexpr (sizeof...(S)) cerr << ", ";
  DBG(forward<S>(y)...);
}
#define debug(...) cerr << "[" << __LINE__ << "]: [" #__VA_ARGS__ "] = [", DBG(__VA_ARGS__)
void ERR() { cerr << endl; }
TES void ERR(T &&x, S &&...y) {
  cerr << x;
  if constexpr (sizeof...(S)) cerr << ", ";
  ERR(forward<S>(y)...);
}
#define err(...) cerr << "[" << __LINE__ << "]: ", ERR(__VA_ARGS__)
#define asser assert
#else
#define debug(...) void(0721)
#define err(...)   void(0721)
#define asser(...) void(0721)
#endif
#line 4 "No_95_Alice_and_Graph.cpp"
// #include "YRS/IO/fast_io.hpp"
// #include "YRS/random/rng.hpp"
#line 2 "YRS/g/Basic.hpp"

#line 2 "YRS/ds/basic/hashmap.hpp"

TE struct hash_map {
  uint ls, msk;
  vc<ull> ke;
  vc<T> val;
  vc<u8> vis;

  ull hash(ull x) const {
    static const ull FIXED_RANDOM =
        std::chrono::steady_clock::now().time_since_epoch().count();
    x += FIXED_RANDOM;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return (x ^ (x >> 31)) & msk;
  }

  void extend() {
    vc<pair<ull, T>> dat;
    const int N = len(vis);
    dat.reserve(N / 2 - ls);
    FOR(i, N) if (vis[i]) dat.ep(ke[i], val[i]);
    build(dat.size() << 1);
    for (Z &[a, b] : dat) (*this)[a] = b;
  }

  hash_map(uint N = 0) { build(N); }

  void build(uint N) {
    uint k = 8;
    while (k < (N << 1)) k <<= 1;
    ls = k >> 1, msk = k - 1;
    ke.resize(k), val.resize(k), vis.assign(k, 0);
  }

  void clear() {
    fill(all(vis), 0);
    ls = (msk + 1) >> 1;
  }

  ll size() const { return vis.size() / 2 - ls; }

  int id(ull k) const {
    int i = hash(k);
    while (vis[i] and ke[i] != k) i = (i + 1) & msk;
    return i;
  }

  T &operator[](ull k) {
    if (ls == 0) extend();
    int i = id(k);
    if (not vis[i]) {
      vis[i] = 1;
      ke[i] = k;
      val[i] = T {};
      --ls;
    }
    return val[i];
  }

  T get(ull k, T fail) const {
    int i = id(k);
    return (vis[i] ? val[i] : fail);
  }

  bool contains(ull k) const {
    int i = id(k);
    return vis[i] and ke[i] == k;
  }

  vc<pair<ull, T>> get_all() const {
    int N = len(vis);
    vc<pair<ull, T>> s;
    FOR(i, N) if (vis[i]) s.ep(ke[i], val[i]);
    return s;
  }

  // f(ke, val);
  void enumerate_all(Z f) const {
    const int N = len(vis);
    FOR(i, N) if (vis[i]) f(ke[i], val[i]);
  }
};
#line 4 "YRS/g/Basic.hpp"

// https://www.luogu.com.cn/problem/P5318

TE struct edge {
  int f, to;
  T w;
  int id;
};
template <typename T = int, bool dir = 0>
struct graph {
  static constexpr bool is_dir = dir;
  int N, M;
  using cost_type = T;
  using ee = edge<T>;
  vc<ee> es;
  vc<int> in;
  vc<ee> c;
  
  bool ok;

  bool isok() { return ok; }

  struct px {
    const graph *g;
    int l, r;
    px(const graph *g, int l, int r) : g(g), l(l), r(r) {}
    const ee *begin() const {
      if (l == r) return 0;
      return &g->c[l];
    }
    const ee *end() const {
      if (l == r) return 0;
      return &g->c[r];
    }
  };

  px operator[](int i) const {
    assert(ok);
    return {this, in[i], in[i + 1]};
  }

  graph() : N(0), M(0), ok(0) {}
  graph(int N) : N(N), M(0), ok(0) {}

  void add(int f, int t, T w = 1, int i = -1) {
    assert(not ok);
    assert(-1 < f and -1 < t and t < N and f < N);
    if (i == -1) i = M;
    Z e = ee({f, t, w, i});
    es.ep(e);
    ++M;
  }

  void build() {
    assert(not ok);
    ok = 1;
    in.assign(N + 1, 0);
    for (Z &&e : es) {
      in[e.f + 1]++;
      if (not dir) in[e.to + 1]++;
    }
    FOR(i, N) in[i + 1] += in[i];
    Z cc = in;
    c.resize(in.back() + 1);
    for (Z &&e : es) {
      c[cc[e.f]++] = e;
      if (not dir) c[cc[e.to]++] = ee({e.to, e.f, e.w, e.id});
    }
  }

  template <bool wt = 0, int of = 1>
  void read_tree() { sc<wt, of>(N - 1); }
  template <bool wt = 0, int of = 1>
  void read_graph(int M) { sc<wt, of>(M); }
  template <bool wt = 0, int of = 1>
  void sc() { sc<wt, of>(N - 1); }
  template <bool wt = 0, int of = 1>
  void sc(int M) {
    es.reserve(M * (dir ? 1 : 2));
    FOR(M) {
      INT(x, y);
      x -= of, y -= of;
      if (not wt) {
        add(x, y);
      } else {
        T w;
        IN(w);
        add(x, y, w);
      }
    }
    build();
  }

  vc<int> deg() {
    vc<int> in(N);
    for (Z &&e : es) ++in[e.f], ++in[e.to];
    return in;
  }

  pair<vc<int>, vc<int>> deg_inout() {
    vc<int> in(N), ou(N);
    for (Z &&e : es) ++in[e.to], ++ou[e.f];
    return {in, ou};
  }

  vc<int> ni;
  vc<u8> vis;
  // 使G中的顶点V[i]在新图表中为i
  // {G, es}
  // sum（deg(v)）的计算量
  // 注意它可能大于新图表的n+M
  graph<T, dir> rearrange(const vc<int> &v, bool keep_eid = 0) {
    if (len(ni) != N) ni.assign(N, -1);
    int N = len(v);
    FOR(i, N) ni[v[i]] = i;
    graph<T, dir> g(N);
    vc<int> s;
    FOR(i, N) {
      for (Z &&e : (*this)[v[i]]) {
        if (len(vis) <= e.id) vis.resize(e.id + 1);
        if (vis[e.id]) continue;
        int f = e.f, to = e.to;
        if (ni[f] != -1 and ni[to] != -1) {
          s.ep(e.id);
          vis[e.id] = 1;
          int id = (keep_eid ? e.id : -1);
          g.add(ni[f], ni[to], e.w, id);
        }
      }
    }
    FOR(i, N) ni[v[i]] = -1;
    for (int i : s) vis[i] = 0;
    return g.build(), g;
  }

  ull has(ull x, ull y) {
    if (not dir and x > y) swap(x, y);
    return x * N + y;
  }

  hash_map<int> mp;
  int get_eid(ull x, ull y) {
    if (mp.size() == 0) {
      mp.build(N - 1);
      for (Z &&e : es) {
        ull x = e.f, y = e.to;
        ull k = has(x, y);
        mp[k] = e.id;
      }
    }
    return mp.get(has(x, y), -1);
  }

  graph rev() const {
    static_assert(dir);
    graph ng(N);
    for (Z &&[f, t, w, id] : es) ng.add(t, f, w, id);
    return ng;
  }
};
#line 2 "YRS/ds/basic/queue.hpp"

// queue_vector_ver
TE struct myqueue {
  int l;
  vc<T> q;

  myqueue() : l(0) {}
  myqueue(int N) : l(0) { q.reserve(N); }
  myqueue(const vc<T> &q) : l(0), q(q) {}

  T &operator[](int x) { 
    if (x < 0) return q.end()[x];
    return q[l + x]; 
  }

  const T &operator[](int x) const { 
    if (x < 0) return q.end()[x];
    return q[l + x]; 
  }

  T &front() { return q[l]; }

  const T &front() const { return q[l]; }

  T &back() { return q.back(); }

  const T &back() const { return q.back(); }

  int size() const { return len(q) - l; }

  bool empty() const { return l == len(q); }

  T pop() { return q[l++]; }

  void push(const T &x) { push_back(x); }

  void push_back(const T& v) { q.push_back(v); }

  void pop_back() { q.pop_back(); }
  
  void clear() { q.clear(), l = 0; }

  vc<T>::iterator end() { return q.end(); }

  template <typename... S>
  void emplace(S &&...args) { q.ep(std::forward<S>(args)...); }
};
#define queue myqueue

TE T pop(queue<T> &q) {
  T x = q.front();
  return q.pop(), x;
}
#line 2 "YRS/ds/basic/retsu.hpp"

TE struct retsu {
  int N, M;
  vc<T> a;

  retsu(int N, int M, T bs = T()) : N(N), M(M), a(N * M, bs) {}

  T* operator[](int i) { return a.data() + i * M; }
  const T* operator[](int i) const { return a.data() + i * M; }

  void fill(T x) { std::fill(all(a), x); }

  vc<vc<T>> to_vector() const {
    vector res(N, vc<T>(M));
    FOR(i, N) FOR(k, M) res[i][k] = a[i * M + k];
    return res;
  }
};

TE istream &operator>>(istream &I, retsu<T> &a) {
  for (Z &e : a.a) I >> e;
  return I;
}
TE ostream &operator<<(ostream &O, retsu<T> &a) {
  FOR(i, a.N) FOR(k, a.M) O << a[i][k] << " \n"[k + 1 == a.M and i + 1 != a.N];
  return O;
}

#ifdef FIO
TE rd(retsu<T> &a) {
  for (Z &e : a.a) rd(e);
}
TE wt(retsu<T> &a) {
  FOR(i, a.N) {
    FOR(k, a.M) {
      if (k) wt(' ');
      wt(a[i][k]);
    }
    if (i != a.M) wt('\n');
  }
}
#endif
#line 2 "YRS/aa/timer.hpp"

struct Timer {
  using re = double;
  chrono::steady_clock::time_point st;
  Timer() : st(chrono::steady_clock::now()) {}
  re sec() const {
    using namespace chrono;
    return duration<re>(steady_clock::now() - st).count();
  }
} timer;
#line 10 "No_95_Alice_and_Graph.cpp"

#define tests 0
#define fl 0
#define DB 10
void Yorisou() {
  INT(N, M, K);
  graph g(N);
  g.read_graph(M);
  // Z st = timer.sec();
  ll msk = 1;
  retsu<u8> dp(1 << (K + 1), N, inf<u8>);
  FOR_R(i, 1, N) {
    // Z st = timer.sec();
    vc<char> s, id(N, -1);
    if (pc(msk) == K + 1) continue;
    msk |= 1ll << i;
    FOR(i, N) if (msk >> i & 1) s.ep(i);
    int sz = len(s);
    FOR(i, sz) id[s[i]] = i;
    
    dp.fill(inf<u8>);
    queue<tuple<u8, int, u8>> q((1 << sz) * N);
    q.eb(0, 1, 0);
    dp[1][0] = 0;
    while (not q.empty()) {
      Z [d, s, n] = pop(q);
      if (d != dp[s][n] or d >= K) continue;
      for (Z &&e : g[n]) {
        if (id[e.to] != -1) {
          int t = 1 << id[e.to] | s;
          if (chmin(dp[t][e.to], d + 1)) q.eb(d + 1, t, e.to);
        } else {
          if (chmin(dp[s][e.to], d + 1)) q.eb(d + 1, s, e.to);
        }
      }
    }
    bool ok = 0;
    FOR(i, N) if (dp[(1 << sz) - 1][i] <= K) ok = 1;
    if (ok == 0) msk ^= 1ll << i;
    // Z ed = timer.sec();
    // debug(ed - st);
  }
  ll s = 0;
  FOR(i, N) if (msk >> i & 1) s += (1ll << i) - 1;
  // debug(timer.sec() - st);
  print(s);
}
#line 1 "YRS/aa/main.hpp"
int main() {
  cin.tie(nullptr)->sync_with_stdio(0);
  int T = 1;
  if (fl) cerr.tie(0);
  if (tests and not fl) IN(T);
  for (int i = 0; i < T or fl; ++i) {
    Yorisou();
    if (fl and i % DB == 0) cerr << "Case: " << i << '\n';
  }
  return 0;
}
#line 58 "No_95_Alice_and_Graph.cpp"