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