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!(
		"{}",
		(0..n[0] as i32).fold(0., |a, i| a + 100. * (1. - n[1]).powi(i))
	);
}