/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2021.02.26 21:23:13
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

int main() {
    int n;cin >> n;
    int sum = 0;
    for (int i = 0; i < n-1; i++) {
        int a;cin >> a;
        sum += a;
    }
    int ans = 0;
    for (int p = 0; p <= 100; p++) {
        if ((sum+p) % n == 0) {
            ans++;
        }
    }
    cout << ans << endl;
    return 0;
}