import java.io.*;
import java.util.Scanner;


public class Main_yukicoder787 {

	private static Scanner sc;
	private static Printer pr;

	private static void solve() {
		double p = sc.nextDouble();
		double q = sc.nextDouble();

		double u = p * q;
		double nu = (100 - p) * (100 - q);

		if (p == 0) {
			pr.println(0);
		} else {
			pr.printf("%.7f%n", u / (nu + u) * 100);
		}
	}

	// ---------------------------------------------------
	public static void main(String[] args) {
		sc = new Scanner(System.in);
		pr = new Printer(System.out);
			
		solve();
			
		pr.close();
		sc.close();
	}

	static class Printer extends PrintWriter {
		Printer(OutputStream out) {
			super(out);
		}
	}
}