#include <bits/stdc++.h>

using namespace std;
int a, b, c;
void input() { cin >> a >> b >> c; }
void solve() {
  cout << ((a + b - 1) / b * 2 / 3 < (a + c - 1) / c ? "NO" : "YES")
       << endl;
}

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  input();
  solve();
}