#include <bits/stdc++.h>

using namespace std;

const int INF = 1<<30;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);

  int n;
  cin >> n;

  vector<vector<int> > edges(n);
  vector<int> deg(n);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < n; j++) {
      int a;
      cin >> a;
      if (a == 1) {
        edges[j].push_back(i);
        deg[i]++;
      }
    }
  }

  vector<int> a(n);
  for (int i = 0; i < n; i++)
    cin >> a[i];

  int ret = INF;  
  for (int mask = 0; mask < 1<<n; mask++) {
    int sum = 0;
    vector<bool> vis(n);
    queue<int> q;
    vector<int> rm = deg;
    for (int i = 0; i < n; i++) {
      if (mask & 1 << i) {
        sum += a[i];
        vis[i] = true;
        q.push(i);
      } else if (!deg[i]) {
        vis[i] = true;
        q.push(i);
      }
    }

    while (!q.empty()) {
      int i = q.front();
      q.pop();

      for (int j: edges[i]) {
        if (!--rm[j] && !vis[j]) {
          vis[j] = true;
          q.push(j);
        }
      }
    }
    
    int tot = 0;
    for (int i = 0; i < n; i++)
      tot += vis[i];
    if (tot == n)
      ret = min(ret, sum);
  }

  cout << ret << endl;
  
  return 0;
}