#include <stdio.h>
#include <math.h>
int main(void){
    double a,b,c,r1,r2;
    scanf("%lf%lf%lf",&a,&b,&c);
    r1=ceil(a/b);
    r2=ceil(a/c);
    if(r1*2/3<r2){
        puts("NO");
    }else puts("YES");
    return 0;
}