import java.util.*;
import java.io.*;
import java.text.*;

public class NickyEnMark{
    public static void main(String[] args) throws IOException {
        Scanner scanner = new Scanner(System.in);
        int x = scanner.nextInt();
        int y = scanner.nextInt();
        double ans = x / (((1.0 * (100 - x) / (100 - y)) * 100.0) - (100 - x));
        System.out.println(ans);
    }
}