#include <stdio.h>
#include <math.h>

//1...n
//S(n)=(n+1)*n/2

long long int n;
int main(){
    scanf("%lld",&n);
    //n*n < n*(n+1) <(n+1)*(n+1)    
    for(long long int m = (int)sqrt(2*n) ; m*(m+1) <= 2*n; m++){
        if(m*(m+1)==2*n){
            puts("YES");
            printf("%lld\n",m);
            return 0;
        }
    }
    puts("NO");
}