#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main(){
  int N;
  cin>>N;
  for(int i=0;i<=1000000;i++){
      if(i*i%1000000==N){
          cout<<"YES"<<endl;
          return 0;
      }
  }
  cout<<"NO"<<endl;
}