#include<stdio.h>

int main(void){
	int a,b,c;
	scanf("%d%d%d",&a,&b,&c);
	if(a%b){b = (a/b)+1;}else{b = a/b;}
	if(a%c){c = (a/c)+1;}else{c = a/c;}
	b = b * 2 / 3;
	if(b >= c){printf("YES\n");}else{printf("NO\n");}
	return 0;
}