#include <bits/stdc++.h>
using namespace std;
using LL=long long;
using ULL=unsigned long long;
#define rep(i,n) for(int i=0; i<(n); i++)

int main(){
  int N; cin>>N;
  int A[100]; rep(i,N-1) cin>>A[i];
  int S=0; rep(i,N-1) S+=A[i];
  int ans=0;
  rep(i,101) if((S+i)/N*N==S+i) ans++;
  cout<<ans<<endl;
  return 0;
}