#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, i, j, sum, min = 1000000000;
  cin >> n;
  int k[n];
  for (i = 0; i < n; i++) cin >> k[i];
  for (i = 0; i < n; i++) {
    sum = 0;
    int m[k[i]];
    for (j = 0; j < k[i]; j++) {
      cin >> m[j];
      sum = sum + 5 * m[j] + 15;
    }
    if (sum < min) min = sum;
  }
  cout << min;
}
