import sys
input = sys.stdin.readline

N,M,K = map(int,input().split())
A = list(map(int,input().split()))

inf = 10**18
dist = [[inf]*N for _ in range(N)]
for _ in range(M):
    X,Y,Z = map(int,input().split())
    X -= 1
    Y -= 1
    dist[X][Y] = Z
    dist[Y][X] = Z
for k in range(N):
    for i in range(N):
        for j in range(N):
            dist[i][j] = min(dist[i][j],dist[i][k]+dist[k][j])


def bit_count(n):
    c = (n & 0x5555555555555555) + ((n >> 1) & 0x5555555555555555)
    c = (c & 0x3333333333333333) + ((c >> 2) & 0x3333333333333333)
    c = (c & 0x0f0f0f0f0f0f0f0f) + ((c >> 4) & 0x0f0f0f0f0f0f0f0f)
    c = (c & 0x00ff00ff00ff00ff) + ((c >> 8) & 0x00ff00ff00ff00ff)
    c = (c & 0x0000ffff0000ffff) + ((c >> 16) & 0x0000ffff0000ffff)
    c = (c & 0x00000000ffffffff) + ((c >> 32) & 0x00000000ffffffff)
    return c


dp = [inf]*(1<<N)
for i in range(N):
    dp[1<<i] = A[i]

ans = inf
for i in range(1,1<<N):
    bc = bit_count(i)
    d = dp[i]
    if bc >= K:
        if bc == K:
            ans = min(ans,d)
        continue
    already = []
    not_yet = []
    for j in range(N):
        if (i>>j) & 1:
            already.append(j)
        else:
            not_yet.append(j)
    for j in not_yet:
        dp[i^(1<<j)] = min(dp[i^(1<<j)],d+A[j]+min(dist[j][k] for k in already))

print(ans)