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