#include <stdio.h>

int main(void) {
	int a, b, c;
	int normal, campaign;
	scanf("%d%d%d", &a, &b, &c);
	normal = (double)a / b + ((a % b != 0)? 1 : 0);
	campaign = (double)a / c + ((a % c != 0)? 1 : 0);
	//printf("%d %d\n", normal, campaign);
	if(3 * campaign <= 2 * normal)printf("YES\n");
	else printf("NO\n");

	return 0;
}