#include <iostream>
using namespace std;
int main(){
    int a,b,c,x,y;
    cin >> a >> b >> c;
    x=(a+b-1)/b;
    y=(a+c-1)/c;
    if(x*2/3>=y)cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}