#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  int n;
  cin >> n;

  int sum = 0;
  rep(i,n-1) {
    int a;
    cin >> a;
    sum += a;
  }
  int ans = 0;
  rep(i,101) {
    if ((sum + i)%n==0) ans++;
  }
  cout << ans << endl;




}