#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    int N;
    cin >> N;

    int sum = 0;
    rep(i, N - 1) {
        int a;
        cin >> a;
        sum += a;
    }

    int ans = 0;
    for (int a = 0; a <= 100; ++a) {
        if ((sum + a) % N == 0) ans++;
    }
    cout << ans << endl;

    return 0;
}