#include <bits/stdc++.h>
using namespace std;
using ll = long long;

struct Graph {
    static constexpr ll INF = 1LL << 60;
    struct Edge {
        int d, i;
    };
    Graph(int n) : e(n), d(n, vector<ll>(n, INF)), n(n) {
        for (int i = 0; i < n; i++) d[i][i] = 0;
    }
    void add_edge(int i, int j, int l) {
        e[i].push_back({ l, j });
        d[i][j] = l;//多重辺はないとする
    }
    void warshall_floyd() {
        for (int k = 0; k < n; k++)
            for (int i = 0; i < n; i++)
                for (int j = 0; j < n; j++)
                    d[i][j] = min(d[i][j], d[i][k] + d[k][j]);
    }
    vector<vector<Edge>> e;
    vector<vector<ll>> d;
    int n;
};

ll dp[19][1 << 18];

int main() {
    int n, m, K;
    cin >> n >> m >> K;

    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    Graph g(n);
    for (int j = 0; j < m; j++) {
        int x, y, z;
        cin >> x >> y >> z;
        x--; y--;

        g.add_edge(x, y, z);
        g.add_edge(y, x, z);
    }
    g.warshall_floyd();

    ll r = 1LL << 60;
    for (int i = 0; i < n; i++) {
        for (int k = 0; k < 1 << n; k++) {
            dp[i][k] = 1LL << 60;
        }
        dp[i][1 << i] = a[i];
        if (1 == K) r = min(r, dp[i][1 << i]);
    }
    for (int k = 0; k < 1 << n; k++) {
        int c = __builtin_popcount(k);
        if (c == 1 || c > K) continue;
        for (int i = 0; i < n; i++) {
            if (k & 1 << i) {
                int l = k ^ 1 << i;
                ll t = 1LL << 60;
                for (int j = 0; j < n; j++) {
                    if (l & 1 << j) {
                        t = min(t, dp[j][l] + g.d[i][j]);
                    }
                }
                dp[i][k] = t + a[i];
                if (c == K) r = min(r, dp[i][k]);
            }
        }
    }
    cout << r << endl;

    return 0;
}