#include <iostream>
using namespace std;

typedef long long LL;

int main(){
    LL a, b, c;
    cin >> a >> b >> c;
    int bn = (a + b - 1) / b;
    int cn = (a + c - 1) / c;
    if(bn * 2 >= cn * 3){
        cout << "YES" << endl;
    }else{
        cout << "NO" << endl;
    }
    return 0;
}