#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
#define rep(i,n) for(int i=0;i<n;i++)

signed main() {
  int a,b,c;
  cin>>a>>b>>c;
  //cout<<(a+b-1)/b<<endl;
  //cout<<(a+c-1)/c<<endl;
  if(((a+b-1)/b)*2 >= ((a+c-1)/c)*3){
    cout<<"YES"<<endl;
  }
  else cout<<"NO"<<endl;
}