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

int n, sum = 0;
vector<int> a;

int main() {
  cin >> n;
  a.resize(n - 1);
  for (auto &p : a) cin >> p, sum += p;
  int res = 0;
  for (int i = 0; i <= 100; ++i)
    if ((i + sum) % n == 0) ++res;
  cout << res << endl;
  return 0;
}