#include <iostream>
#include <string>
#include <stdio.h>
#include <stdint.h>
using namespace std;

using ll = long long;

#define CIN( LL , A ) LL A; cin >> A 
#define FOR( VAR , INITIAL , FINAL_PLUS_ONE ) for( ll VAR = INITIAL ; VAR < FINAL_PLUS_ONE ; VAR ++ ) 
#define RETURN( ANSWER ) cout << ( ANSWER ) << endl; return 0 

int main()
{
  CIN( ll , S );
  FOR( i , 0 , 500001 ){
    if( S == ( i * i ) % 1000000 ){
      RETURN( "YES" );
    }
  }
  RETURN( "NO" );
}