import sys
input = sys.stdin.readline
from collections import *

N, M, K = map(int, input().split())
A = list(map(int, input().split()))
d = [[10**18]*N for _ in range(N)]

for i in range(N):
    d[i][i] = 0

for _ in range(M):
    X, Y, Z = map(int, input().split())
    d[X-1][Y-1] = Z
    d[Y-1][X-1] = Z

for k in range(N):
    for i in range(N):
        for j in range(N):
            d[i][j] = min(d[i][j], d[i][k]+d[k][j])

cost = [[10**18]*(1<<N) for _ in range(N)]

for v in range(N):
    for S in range(1<<N):
        for nv in range(N):
            if (S>>nv)&1:
                cost[v][S] = min(cost[v][S], d[v][nv])

dp = [[10**18]*(1<<N) for _ in range(K+1)]
dp[0][0] = 0

for i in range(K):
    for S in range(1<<N):
        for v in range(N):
            if (S>>v)&1:
                continue
            
            dp[i+1][S|(1<<v)] = min(dp[i+1][S|(1<<v)], dp[i][S]+A[v]+(0 if S==0 else cost[v][S]))

print(min(dp[K]))