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

  long in,out=0,i=1;

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