#include<iostream>
#include<string>
#include<iomanip>
#include<cmath>
#include<vector>
#include<algorithm>
#include<utility>

using namespace std;

#define int long long
#define endl "\n"

constexpr long long INF = (long long)1e18;
constexpr long long MOD = 1'000'000'007; 

struct fast_io {
	fast_io(){
		std::cin.tie(nullptr);
		std::ios::sync_with_stdio(false);
	};
} fio;

signed main(){
	cout<<fixed<<setprecision(10);
	
	int N;
    int sum = 0;
    
    cin>>N;
    
    for(int i = 0; i < N-1; i++){
        int A;
        
        cin>>A;
        
        sum += A;
    }
    
    int con = 0;
    
    for(int i = 0; i <= 100; i++){
        if((sum + i) % N == 0) {
            con++;
        }
    }
    
    cout<<con<<endl;
	
	
	return 0;
}