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

int main()
{
	int N;
	cin >> N;
	int s = 0;
	for( int i = 0; i < N - 1; i++ ) {
		int A;
		cin >> A;
		s += A;
	}

	int ans = 0;
	for( int n = 0; n <= 100; n++ ) {
		if( (s + n) % N == 0 ) ans++;
	}

	cout << ans << endl;
}