#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  int sum = 0;
  for(int i=0;i<N-1;i++){
      int x;
      cin>>x;
      sum += x;
  }
  int ans = 0;
  for(int i=0;i<=100;i++)if((sum+i)%N == 0) ans++;
  cout<<ans<<endl;
}