#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, s, sum = 0;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> s;
    sum += s;
  }
  int cnt = 0;
  for (int i = 1; i <= 5; i++) {
    if ((sum + i) % (n + 1) != 1) cnt += 1;
  }
  cout << cnt << endl;
}
