#include <stdio.h>

int main(void){
    __int64_t n,c=0,a=0; 
	scanf("%lld", &n);
	for (int i = 1; i <= n; i++){
		a += i;
		c++;
		if (a == n) {
			printf("YES\n%lld",c);
			break;
		}
		else if (a >= n) {
			printf("NO");
			break;
		}
	}
}