#include<bits/stdc++.h>
using namespace std;

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