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

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