#include <stdio.h>

const int bit[19] = {1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072, 262144};
const long long sup = 1LL << 60;

void chmin(long long* a, long long b)
{
	if (*a > b) *a = b;
}

long long dp[262144];

int main()
{
	int i, N, M, K, A[18], u, v, w, c;
	long long dist[18][18];
	scanf("%d %d %d", &N, &M, &K);
	for (u = 0; u < N; u++) for (w = 0; w < N; w++) dist[u][w] = sup;
	for (i = 0; i < N; i++) scanf("%d", &(A[i]));
	for (i = 0; i < M; i++) {
		scanf("%d %d %d", &u, &w, &c);
		u--;
		w--;
		dist[u][w] = c;
		dist[w][u] = c;
	}
	for (v = 0; v < N; v++) {
		for (u = 0; u < N; u++) {
			for (w = 0; w < N; w++) chmin(&(dist[u][w]), dist[u][v] + dist[v][w]);
		}
	}
	
	int j, k, l;
	long long min, ans = sup;
	for (k = 0; k < bit[N]; k++) dp[k] = sup;
	for (u = 0; u < N; u++) dp[bit[u]] = A[u];
	for (k = 1, l = 1; k < bit[N]; k++, l++) {
		for (j = 0; (k & bit[j]) == 0; j++) l--;
		if (l == K) chmin(&ans, dp[k]);
		if (dp[k] == sup) continue;
		for (u = 0; u < N; u++) {
			if ((k & bit[u]) != 0) continue;
			for (w = 0, min = sup; w < N; w++) if ((k & bit[w]) != 0) chmin(&min, dist[u][w]);
			chmin(&(dp[k ^ bit[u]]), dp[k] + A[u] + min);
		}
	}
	printf("%lld\n", ans);
	fflush(stdout);
	return 0;
}