#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

int main(){
  int A, B, C; cin >> A >> B >> C;
  int ans = (A+B-1)/B;
  int ans2 = (A+C-1)/C;
  //cout << ans2*3 << " " << ans*2 << endl;
  if(ans2*3 <= ans*2) cout << "YES" << endl;
  else cout << "NO" << endl;
}