#include <stdio.h>

int main(void)
{
	int a,b,c;
	double bu,cu;
	scanf("%d",&a);
	scanf("%d",&b);
	scanf("%d",&c);

	bu = (double)a / b;
	b = (int)bu + ((bu>(int)bu)? 1:0);
	cu = (double)a / c;
	c = (int)cu + ((cu>(int)cu)? 1:0);
	if ((double)c / b <= 2.0/3.0) printf("YES\n");
	else printf("NO\n");
	
	return 0;
}