#include<iostream>
#include<cmath>

using  namespace std;

int main(){
    double a,b,c;
    cin >> a >> b >> c;
    int ex1 = (int)ceil(a/b);
    int ex2 = (int)ceil(a/c);
    if(2*ex1 >= 3*ex2) cout << "YES" << endl;
    else cout << "NO" << endl;
    return 0;
}