#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef int64_t lint;
#define rep(i, n) for(int i=0; i<n; i++)
#define repx(i, l, n) for(int i=l; i<n; i++)
#define all(v) v.begin(), v.end()
#define show(x) cout << #x << ": " << x << endl;
#define list(x) cout << #x << ": " << x << "  ";
#define pb push_back
using vi = vector<lint>;
using vvi = vector<vector<lint>>;
template<class T> inline void vin(vector<T>& v) { rep(i, v.size()) cin >> v.at(i); }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class T> inline void drop(T x) { cout << x << endl; exit(0); }
template<class T> void vout(vector<T> v) { rep(i, v.size()) { cout << v.at(i) << ' '; } cout << endl; }
constexpr lint LINF = LLONG_MAX/2;
lint node, start;
vvi dist(18, vi(18));  // 事前に準備しておく
vector<vector<lint>> dp((1<<18), vector<lint>(18, -1));
vi A(18);

lint rec(lint bit, lint v) {
	if (dp[bit][v] != -1) return dp[bit][v];
	if (bit == (1<<v)) return dp[bit][v] = start+A[v];
	lint res = LINF,  prev_bit = bit & ~(1<<v);
	for (lint u = 0; u < node; ++u) {
		if (!(prev_bit & (1<<u))) continue;
		lint d = LINF;
		rep(i, node) {
			if ((prev_bit & (1<<i)) && i != v) chmin(d, dist[i][v]);
		}
		d += rec(prev_bit, u);
		chmin(res, d+A[v]);
	}
	return dp[bit][v] = res;
}

lint bitDP(lint N, lint s) {
	node = N, start = s;  // 初期コスト
	lint res = LINF;
	rep(i, node) chmin(res, rec((1<<node)-1, i));
	return res;
}

void Floyd_Warshall(lint N, lint M) {
	lint x, y, z;
	rep(i, N) {
		rep(j, N) {
			if (i == j) dist[i][j] = 0;
			else dist[i][j] = LINF;
		}
	}
	rep(i, M) {
		cin >> x >> y >> z;
		x--, y--;
		dist[x][y] = z;
		dist[y][x] = z;
	}
	rep(k, N) {
		rep(i, N) {
			rep(j, N) {
				chmin(dist[i][j], dist[i][k]+dist[k][j]);
			}
		}
	}
}

int main() {
	lint N, M, K;
	cin >> N >> M >> K;
	rep(i, N) cin >> A[i];
	Floyd_Warshall(N, M);

	lint a=LINF, b=0, c=0, x, y, z;
	bitDP(N, 0);
	rep(i, 1<<N) {
		if (__builtin_popcount(i) == K) {
			rep(j, N) {
				if (dp[i][j] != -1) chmin(a, dp[i][j]);
			}
		}
	}
	std::cout << a << '\n';
}