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

int main(){
  int a, b, c;
  cin >> a >> b >> c;
  double regular = ceil(a / b);
  double campaign = ceil(a / c);
  double theta = 2 / 3.0;
  if(campaign / regular <= theta)
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
}