from collections import deque

N = int(input())
ins = [0]*N
outs = [[] for _ in range(N)]

for i in range(N):
    Xi = list(map(int, input().split()))
    
    for j in range(N):
        if Xi[j]==1:
            ins[i] += 1
            outs[j].append(i)

A = list(map(int, input().split()))

for i in range(N):
    if ins[i]==0:
        A[i] = 0
        
ans = 10**18

for i in range(2**N):
    ans_cand = 0
    q = deque([])
    ins_ = ins[:]
    flag = [False]*N
    
    for j in range(N):
        if (i>>j)&1:
            ans_cand += A[j]
            q.append(j)
            
    while q:
        v = q.popleft()
        
        if flag[v]:
            continue
        
        flag[v] = True
        
        for nv in outs[v]:
            ins_[nv] -= 1
            
            if ins_[nv]==0:
                q.append(nv)
        
    if flag==[True]*N:
        ans = min(ans, ans_cand)

print(ans)