#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int main(){

    int N, S=0, A, ans=0;
    cin >> N;
    for (int i=0; i<N-1; i++){
        cin >> A;
        S += A;
    }

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

    cout << ans << endl;

    return 0;
}