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

int main(){
	double all,normal,campaign;
	scanf("%lf%lf%lf",&all,&normal,&campaign);
	
	normal = ceil(all / normal);
	campaign = ceil(all / campaign);

	double enough = normal * 2 / 3;

	if(campaign > enough){
		printf("NO");
	}else{
		printf("YES");
	}
}