#include <stdio.h>
int main(){

  long in,out=0,i=0;

  scanf("%ld\n", &in);
  while(in>out){
    out+=i;
    if(in==out){
      printf("YES\n%ld\n", i);
      return 0;
    }
    i++;
  }
  printf("NO\n");

  return 0;
}