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

signed main(){
  int a, b, c; cin >> a >> b >> c;
  int x = ( a + b - 1 ) / b;
  int y = ( a + c - 1 ) / c;
  if( 1.0 * y <= 1.9 * x / 3 * 2 )
    cout << "YES" << endl;
  else
    cout << "NO" << endl;
  return 0;
}