#include <stdio.h>

int main(){
	long all,normal,campaign;
	scanf("%ld%ld%ld",&all,&normal,&campaign);
	
	long sum1 = 0;
	long normalcount = 0; 
	while(sum1 < all){
		sum1 += normal;
		normalcount++;
	}
	
	long sum2 = 0;
	long campaigncount = 0;
	while(sum2 < all){
		sum2 += campaign;
		campaigncount++;
	}
	
	if(campaigncount * 1.5 >= normalcount){
		printf("YES");
	}else{
		printf("NO");
	}
}