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