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

int main()
{
  int a, b, c;

  cin >> a >> b >> c;

  b = a / b;
  c = a / c;
  if (b / 3 * 2 >= c){
    cout << "YES";
  }
  else {
    cout << "NO";
  }
  cout << endl;
}