#include <bits/stdc++.h>
using namespace std;
const long long INF = 1000000000000;
int main(){
  int N, M, K;
  cin >> N >> M >> K;
  vector<int> A(N);
  for (int i = 0; i < N; i++){
    cin >> A[i];
  }
  vector<vector<long long>> E(N, vector<long long>(N, INF));
  for (int i = 0; i < M; i++){
    int X, Y, Z;
    cin >> X >> Y >> Z;
    X--;
    Y--;
    E[X][Y] = Z;
    E[Y][X] = Z;
  }
  for (int i = 0; i < N; i++){
    for (int j = 0; j < N; j++){
      for (int k = 0; k < N; k++){
        E[j][k] = min(E[j][k], E[j][i] + E[i][k]);
      }
    }
  }
  vector<long long> dp(1 << N, INF);
  dp[0] = 0;
  for (int i = 0; i < (1 << N); i++){
    for (int j = 0; j < N; j++){
      if ((i >> j & 1) == 0){
        long long c = A[j];
        if (i > 0){
          long long mn = INF;
          for (int k = 0; k < N; k++){
            if ((i >> k & 1) == 1){
              mn = min(mn, E[j][k]);
            }
          }
          c += mn;
        }
        dp[i | (1 << j)] = min(dp[i | (1 << j)], dp[i] + c);
      }
    }
  }
  long long ans = INF;
  for (int i = 0; i < (1 << N); i++){
    if (__builtin_popcount(i) == K){
      ans = min(ans, dp[i]);
    }
  }
  cout << ans << endl;
}