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

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