#include<bits/stdc++.h>

using namespace std;

using int64 = long long;

// const int mod = 1e9 + 7;
const int mod = 998244353;

const int64 infll = (1LL << 62) - 1;
const int inf = (1 << 30) - 1;

struct IoSetup {
  IoSetup() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    cerr << fixed << setprecision(10);
  }
} iosetup;


template< typename T1, typename T2 >
ostream &operator<<(ostream &os, const pair< T1, T2 > &p) {
  os << p.first << " " << p.second;
  return os;
}

template< typename T1, typename T2 >
istream &operator>>(istream &is, pair< T1, T2 > &p) {
  is >> p.first >> p.second;
  return is;
}

template< typename T >
ostream &operator<<(ostream &os, const vector< T > &v) {
  for(int i = 0; i < (int) v.size(); i++) {
    os << v[i] << (i + 1 != v.size() ? " " : "");
  }
  return os;
}

template< typename T >
istream &operator>>(istream &is, vector< T > &v) {
  for(T &in: v) is >> in;
  return is;
}

template< typename T1, typename T2 >
inline bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }

template< typename T1, typename T2 >
inline bool chmin(T1 &a, T2 b) { return a > b && (a = b, true); }

template< typename T = int64 >
vector< T > make_v(size_t a) {
  return vector< T >(a);
}

template< typename T, typename... Ts >
auto make_v(size_t a, Ts... ts) {
  return vector< decltype(make_v< T >(ts...)) >(a, make_v< T >(ts...));
}

template< typename T, typename V >
typename enable_if< is_class< T >::value == 0 >::type fill_v(T &t, const V &v) {
  t = v;
}

template< typename T, typename V >
typename enable_if< is_class< T >::value != 0 >::type fill_v(T &t, const V &v) {
  for(auto &e: t) fill_v(e, v);
}

template< typename F >
struct FixPoint : F {
  FixPoint(F &&f) : F(forward< F >(f)) {}

  template< typename... Args >
  decltype(auto) operator()(Args &&... args) const {
    return F::operator()(*this, forward< Args >(args)...);
  }
};

template< typename F >
inline decltype(auto) MFP(F &&f) {
  return FixPoint< F >{forward< F >(f)};
}

int main() {
  int N, M, K;
  cin >> N >> M >> K;
  vector< int > A(N);
  cin >> A;
  auto g = make_v< int64 >(N, N);
  fill_v(g, infll);
  for(int i = 0; i < N; i++) {
    g[i][i] = 0;
  }
  for(int i = 0; i < M; i++) {
    int a, b, c;
    cin >> a >> b >> c;
    --a, --b;
    chmin(g[a][b], c);
    chmin(g[b][a], c);
  }
  for(int k = 0; k < N; k++) {
    for(int i = 0; i < N; i++) {
      for(int j = 0; j < N; j++) {
        chmin(g[i][j], g[i][k] + g[k][j]);
      }
    }
  }
  auto dp = make_v< int64 >(1 << N);
  fill_v(dp, infll);
  for(int i = 0; i < N; i++) {
    dp[1 << i] = A[i];
  }
  int64 ret = infll;
  for(int i = 0; i < (1 << N); i++) {
    for(int j = 0; j < N; j++) {
      for(int k = 0; k < N; k++) {
        if((i >> j) & 1 && (~i >> k) & 1) {
          chmin(dp[i | (1 << k)], dp[i] + g[j][k] + A[k]);
        }
      }
    }
    if(__builtin_popcount(i) == K) {
      chmin(ret, dp[i]);
    }
  }
  cout << ret << "\n";
}