fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let mut n: Vec<u64> = s.split_whitespace().flat_map(str::parse).collect();
	let mut a = 0;
	while n[0] > 0 {
		a += 1;
		n[0] /= n[1];
	}
	println!("{}", 2u64.pow(a) - 1);
}