#include <stdio.h>

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