#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<map>
using namespace std;
int main() {
	int n;
	int cnt=0;
	int sum = 0;
	cin >> n;
	vector<int> a(n-1);
	for (int i = 0; i < n-1; i++) {
		cin >> a[i];
		sum += a[i];
	}
	for (int i = 0; i <= 100; i++) {
		if ((sum + i) % n == 0) cnt += 1;
	}
	if (n == 1) cout << 0 << endl;
	else cout << cnt << endl;
	return 0;
}