fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: Vec<u64> = s.split_whitespace().flat_map(str::parse).collect();
	println!(
		"{}",
		if n[0] * n[1] % n[2] == n[3] % n[2] {
			"YES"
		} else {
			"NO"
		}
	)
}