#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000001



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