#include <iostream>
#include <random>
#include <algorithm>
#define INF 1000000000
using namespace std;
// #define int long long



signed main(){
  int a,b,c;
  cin >> a >> b >> c;
  int S1 = (a+b-1)/b;
  int S2 = (a+c-1)/c;
  if((double)S2/S1 <= double(2/3)){
    cout << "YES" << endl;
    return 0;
  }
  cout << "NO" << endl;
}