#include <iostream>
#include <algorithm>
#include <iomanip>
using namespace std;

int main(){
  double a,b,c,d,e,f,g;
  int x,y;
  cin>>a;
  cin>>b;
  cin>>c;
  d=a/b;
  e=a/c;
  x=ceil(d);
  y=ceil(e);
  f=x*2/3;
  g=y;
  if(f>=g){
    cout<<"YES"<<endl;
  } else {
    cout<<"NO"<<endl;
  }
  return 0;
}