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

using namespace std;

int main(){

    int a, b, c;
    cin>> a>> b>> c;

    int cnt1 = ceil((double)a/b);
    int cnt2 = ceil((double)a/c);

    if(2*cnt1 >= 3*cnt2){
        cout<< "YES"<< endl;
    }else{
        cout<< "NO"<< endl;
    }

    return 0;
}