#include <bits/stdc++.h>
#define FastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using namespace std;

void solve() {
  int n;
  cin >> n;
  vector<int> An(n - 1);
  for (auto &A : An) cin >> A;

  int sum = 0;
  for (const auto &a : An) sum += a;

  int count = 0;
  for (int i = 0; i <= 100; i++) {
    if ((sum + i) % n == 0) {
      count++;
    }
  }

  cout << count << '\n';
}

int main() {
  FastIO;
  solve();
  return 0;
}