#include <stdio.h>
#include <math.h>

int main(void){
    int i, a, b, c, neednum, neednum2;
    scanf("%d %d %d", &a, &b, &c);
    neednum = (int)ceil((double)a / b);
    neednum2 = (int)ceil((double)a / c);
    if(neednum2*3<=neednum*2){
        printf("YES\n");
    }else{
        printf("NO\n");
    }
    return 0;
}