use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let n: Vec<f64> = s.split_whitespace().flat_map(str::parse).collect();
	println!(
		"{}",
		if (n[0] / n[1]).ceil() < 1.5 * (n[0] / n[2]).ceil() {
			"NO"
		} else {
			"YES"
		}
	)
}