#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int a, b, c;
  cin >> a >> b >> c;
  int x = (a + b - 1) / b, y = (a + c - 1) / c;
  cout << (3 * y <= 2 * x ? "YES" : "NO") << endl;
  return 0;
}