#include<iostream>
#include<string>
#include<algorithm>
#include<cmath>
#include<iomanip>
#include<cstring>
#include<map>
#include<vector>
using namespace std;
typedef long long int ll;

int main(){

  int a, b, c;
  cin >> a >> b >> c;
  int x=(a+b-1)/b;
  int y=(a+c-1)/c;
  cout << (x*2>=y*3 ? "YES" : "NO") << endl;

  return 0;
}