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