#include <stdio.h>

int main() {
	int a, b, c, nor, cam;

	scanf("%d %d %d", &a, &b, &c);
	nor = (a % b == 0) ? (a / b) : (a / b + 1);
	cam = (a % c == 0) ? (a / c) : (a / c + 1);

	if (cam <= nor * (2.0 / 3.0)) printf("YES\n");
	else printf("NO\n");

	return 0;
}