#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<map>
#include<queue>
#include<string>
#include<sstream>
#include<cmath>
using namespace std;

int main(){

  int a, b, c;
  cin >> a >> b >> c;

  int ab = a/b;
  if( a%b != 0 ) ab += 1;
  int ac = a/c;
  if( a%c != 0 ) ac += 1;

  double t = ab*1.0 / ac;
  if( t >= 1.5 ) cout << "YES" << endl;
  else cout << "NO" << endl;


  return 0;
}