#include <bits/stdc++.h>
using namespace std;
int main(){
  string S;
  cin >> S;
  int A = stoi(S);
  bool ok = false;
  for (int i = 0; i < 1000000; i++){
    if ((long long) i * i % 1000000 == A){
      ok = true;
    }
  }
  if (ok){
    cout << "YES" << endl;
  } else {
    cout << "NO" << endl;
  }
}