#include <iostream>
#include <iomanip>

typedef long long ll;

int main(void)
{
  std::cin.tie(0);
  std::ios::sync_with_stdio(false);
  std::cout << std::fixed << std::setprecision(8);
  ll a, b, c;
  std::cin >> a >> b >> c;
  ll b_need = (a-1)/b+1, c_need = (a-1)/c+1;
  std::cout << (b_need*2 >= c_need*3 ? "YES" : "NO") << std::endl;
  return 0;
}