#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
using namespace std;
int main() {
	int n;
	cin >> n;
	int co = 0, ans = 0;
	for (int i = 0; i < n - 1; i++) {
		int a;
		cin >> a;
		co += a;
		co %= n;
	}
	for (int i = 0; i <= 100; i++) {
		if ((co + i) % n == 0) {
			ans++;
		}
	}
	cout << ans << endl;
}