#include<stdio.h>
#include<algorithm>
using namespace std;
int main(){
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	int d=(a+b-1)/b;
	int e=(a+c-1)/c;
	if(e<=d*2/3)printf("YES\n");
	else printf("NO\n");
}