import java.util.*;
public class Test10 {
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String line;
    line=sc.nextLine();
    int a=Integer.parseInt(line),n=1+2;
    String result="NO";
    for(int i=3;result.equals("NO");i++){
      n+=i;
      if(a<n){
        break;
      }
      if((a-n)%i==0){
        result="YES";
        break;
      }
    }
    System.out.println(result);
    sc.close();
  }
}