#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  vector<string> w;
  for (int i = 0; i < n; ++i) {
    string tmp;
    cin >> tmp;
    w.push_back(tmp);
  }
  int flag = 0;
  int len = 0;
  int output = 100000000;
  for (int i = 0; i < n; ++i) {
    flag = 0;
    len = 0;
    for (int j = i; j < n; ++j) {
      len += w[j].size();
      if (flag == 0 || flag == 2) {
        if (len == 5) {
          len = 0;
          flag++;
        } else if (len > 5) {
          break;
        }
      } else {
        if (len == 7) {
          len = 0;
          flag++;
        } else if (len > 7) {
          break;
        }
      }
    }
    if (flag >= 5) {
      output = i + 1;
      break;
    }
  }
  cout << output << endl;
}
