#include <iostream>
using namespace std;
int main(){
    int N,A,sum=0,cnt=0;
    cin >> N;
    for(int i=0;i<N-1;i++){cin >> A;sum+=A;}
    for(int x=0;x<=100;x++)if((x+sum)%N==0)cnt++;
    cout << cnt;
    return 0;
}