import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int a = sc.nextInt();
    	int b = sc.nextInt();
    	int max = Math.max(a, b);
    	int min = Math.min(a, b);
    	if (max == min) {
    	    System.out.println(Math.sqrt(Math.pow(max, 2) + Math.pow(min, 2)));
    	} else {
    	    System.out.println(Math.sqrt(Math.pow(max, 2) - Math.pow(min, 2)));
    	}
	}
}