#include<iostream>
#include<string>
#include<vector>
#include<math.h>
#include<algorithm>
using namespace std;

int main(){
  long long int a,b,c;
  cin >> a >> b >> c;
  long long d[]={ (a+b-1)/b , (a+c-1)/c };
  cout << ( d[0]*2 < d[1]*3 ? "NO" : "YES" )  <<endl;
  return 0;
}