#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define srep(i,a,b) for(int i = a; i < b; i++)
#define all(A) (A).begin(),A.end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using P = pair<char,int>;
using Graph = vector<vector<int>>;

int main(void){
	int n; cin >> n;
	int av = 0.0;
	rep(i,n-1){
		int a; cin >> a;
		av += a;
	}
	if(n == 1){
		cout << 101;
		return 0;
	}
	int res = 0;
	rep(i,101) if((av+i)%n == 0) res++;
	cout << res << endl;
}