import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		double r = sc.nextDouble();
		sc.close();

		double ans = 0;
		double x = 100;
		for (int i = 0; i < n; i++) {
			ans += x;
			x *= (1 - r);
		}
		System.out.println(ans);
	}
}