//Normal

#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

void print(auto a){
  cout << a;
}

void prints(auto a){
  cout << a << " ";
}

void prints(){
  cout << " ";
}

void printl(auto a){
  cout << a << endl;
}

void printl(){
  cout << endl;
}

void fix(int n){
  cout << fixed << setprecision(n);
}

int main(){
  int A, B, C; cin >> A >> B >> C;

  int X = (A+B-1)/B;
  int Y = (A+C-1)/C;

  Y*1.5 <= X ? printl("YES") : printl("NO");

  return 0;
}