#include <bits/stdc++.h>
using namespace std;
//using namespace atcoder;
struct fast_ios { fast_ios(){ cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;
#define FOR(i, begin, end) for(int i=(begin);i<(end);i++)
#define REP(i, n) FOR(i,0,n)
#define IFOR(i, begin, end) for(int i=(end)-1;i>=(begin);i--)
#define IREP(i, n) IFOR(i,0,n)
#define Sort(v) sort(v.begin(), v.end())
#define Reverse(v) reverse(v.begin(), v.end())
#define all(v) v.begin(),v.end()
#define SZ(v) ((int)v.size())
#define Lower_bound(v, x) distance(v.begin(), lower_bound(v.begin(), v.end(), x))
#define Upper_bound(v, x) distance(v.begin(), upper_bound(v.begin(), v.end(), x))
#define chmax(a, b) a = max(a, b)
#define chmin(a, b) a = min(a, b)
#define bit(n) (1LL<<(n))
#define debug(x) cout << #x << "=" << x << endl;
#define vdebug(v) { cout << #v << "=" << endl; REP(i_debug, (int)v.size()){ cout << v[i_debug] << ","; } cout << endl; }
#define mdebug(m) { cout << #m << "=" << endl; REP(i_debug, (int)m.size()){ REP(j_debug, (int)m[i_debug].size()){ cout << m[i_debug][j_debug] << ","; } cout << endl;} }
#define pb push_back
#define fi first
#define se second
#define int long long
#define INF 1000000000000000000
template<typename T> istream &operator>>(istream &is, vector<T> &v){ for (auto &x : v) is >> x; return is; }
template<typename T> ostream &operator<<(ostream &os, vector<T> &v){ for(int i = 0; i < (int)v.size(); i++) { cout << v[i]; if(i != (int)v.size() - 1) cout << endl; }; return os; }
template<typename T1, typename T2> ostream &operator<<(ostream &os, pair<T1, T2> p){ cout << '(' << p.first << ',' << p.second << ')'; return os; }
template<typename T> void Out(T x) { cout << x << endl; }
template<typename T1, typename T2> void chOut(bool f, T1 y, T2 n) { if(f) Out(y); else Out(n); }

using vec = vector<int>;
using mat = vector<vec>;
using Pii = pair<int, int>;
using v_bool = vector<bool>;
using v_Pii = vector<Pii>;

//int dx[4] = {1,0,-1,0};
//int dy[4] = {0,1,0,-1};
//char d[4] = {'D','R','U','L'};

const int mod = 1000000007;
//const int mod = 998244353;

template<typename T> 
struct edge{ int to; T cost; int id; };

template<typename T = long long>
struct Graph
{

    int N;
    vector<vector<edge<T>>> E;

    Graph(int N): N(N){
        E = vector<vector<edge<T>>>(N, vector<edge<T>>(0));
    }

    void add_Directed_edge(int from, int to, T cost = 1, int id = 0){
        E[from].push_back(edge<T>({ to, cost, id }));
    }

    void add_Undirected_edge(int v1, int v2, T cost = 1, int id = 0){
        add_Directed_edge(v1, v2, cost, id);
        add_Directed_edge(v2, v1, cost, id);
    }

    vector<vector<T>> waeshall_floyd(T T_INF = INF){
        vector<vector<T>> d(N, vector<T>(N, T_INF));
        REP(i, N) d[i][i] = 0;
        REP(i, N) for(auto e: E[i]){
            d[i][e.to] = min(d[i][e.to], e.cost);
        }
        REP(k, N) REP(i, N) REP(j, N) d[i][j] = min(d[i][j], d[i][k] + d[k][j]);

        return d;
    }

};

signed main(){

    int N, M, K; cin >> N >> M >> K;
    vec A(N); cin >> A;
    Graph G(N);
    REP(i, M){
        int x, y, z; cin >> x >> y >> z;
        x--; y--;
        G.add_Undirected_edge(x, y, z);
    }
    auto d = G.waeshall_floyd();

    mat cost(N, vec(bit(N), INF));
    REP(i, N){
        cost[i][0] = A[i];
        FOR(k, 1, bit(N)) if(((k >> i) & 1) == 0){
            REP(j, N) if((k >> j) & 1) chmin(cost[i][k], A[i] + d[i][j]);
        }
    }
    vec dp(bit(N), INF);
    dp[0] = 0;
    FOR(k, 1, bit(N)){
        REP(i, N) if((k >> i) & 1) chmin(dp[k], dp[k ^ bit(i)] + cost[i][k ^ bit(i)]);
    }
    int ans = INF;
    REP(k, bit(N)) if(__builtin_popcountll(k) == K) chmin(ans, dp[k]);
    Out(ans);

    return 0;
}