#include <iostream> 
#include <algorithm> 
using namespace std;

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