N,M,K = map(int,input().split())
A = list(map(int,input().split()))
if N == 1:
    print(min(A))
    exit(0)
INF = 1 << 60
dist = [[INF] * N for i in range(N)]
for i in range(N):
    dist[i][i] = 0

for _ in range(M):
    x,y,z = map(int,input().split())
    dist[x - 1][y - 1] = z
    dist[y - 1][x - 1] = 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 popcnt(x):
    res = 0
    while x:
        res += (x & 1)
        x >>= 1
    return res

dp = [INF] * (1 << N)
for i in range(N):
    dp[1 << i] = A[i]
    
for status in range(1 << N):
    for from_v in range(N):
        if (status >> from_v) & 1 == 0:
            continue
        for to_v in range(N):
            if (status >> to_v) & 1:
                continue
            dp[status | (1 << to_v)] = min(dp[status | (1 << to_v)], dp[status] + dist[from_v][to_v] + A[to_v])

ans = INF          
for status in range(1 << N):
    if popcnt(status) == K:
        ans = min(ans, dp[status])
            
print(ans)