import java.io.*;

public class FunctionOptimising {
	public static void main(String[] args) throws IOException {
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		double before, after;
		String[] parts = reader.readLine().split(" ");
		before = Double.valueOf(parts[0]) * 0.01;
		after = Double.valueOf(parts[1]) * 0.01;

		System.out.println(before / (1.0 - before) * (1.0 - after) / after);
	}
}