import java.util.*;

class demo 
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
        double l, b, d;
        System.out.println("Enter the length and breadth of the rectangle:");
        l = sc.nextDouble();
        b = sc.nextDouble();
        d = Math.sqrt(l * l + b * b);
        System.out.println("Diagonal= " + d);
    }
}