import java.util.Scanner;
 
public class Main{
 
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		long a=s.nextInt();
		long b=s.nextInt();
		
		long max=Math.max(a, b);
		long min=Math.min(a, b);
		
		double c=Math.sqrt((double)max*max-min*min);
		System.out.println(c);
	}
}