#include <iostream>
using namespace std;

int main(void) {
  int a, b, c;
  cin >> a >> b >> c;
  int x = a / b + (a%b>0);
  int y = a / c + (a%c>0);
  string res;
  if(2*x >= 3*y) { res = "YES"; }
  else { res = "NO"; }
  cout << res << endl;
  return 0;
}