import java.util.Scanner;

public class Main {

	@SuppressWarnings("resource")
	public static void main(String args[]) {
		Scanner scanner = new Scanner(System.in);
		int a=scanner.nextInt();
		int b=scanner.nextInt();
		if(a==b) {
			System.out.println(Math.sqrt(Math.pow(a, 2)*2));
			return;
		}
		double c=Math.pow(Math.max(a, b),2)-Math.pow(Math.min(a, b), 2);
		System.out.println(Math.sqrt(c));
	}
}