#include <stdio.h>

int main() {
	int a, b, c;
	double normal, unnormal;
	double res;

	scanf("%d", &a);
	scanf("%d", &b);
	scanf("%d", &c);

	normal = (double)a / (double)b; //普段必要な素材の2/3
	normal = normal * 2.0 / 3.0;
	unnormal = (double)a / (double)c; //キャンペーン中に必要な素材
	if(normal != (int)normal) {
		normal = (int)normal + 1;
	}
	if(unnormal != (int)unnormal) {
		unnormal = (int)unnormal + 1;
	}
	res = normal * 2.0 / 3.0;
	
	if(res < unnormal){
		printf("NO\n");
	} else {
		printf("YES\n");
	}
	
	return 0;
}