import java.util.*;

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