// 	calulate the side of cone
//	Math formula: s = sqrt( h^2 + r^2 )
//
//	Java: s = Math.sqrt( h*h + r*r);
// 				s = Math.sqrt( Math.pow(h, 2.) + Math.pow(r, 2.) );

import java.util.Scanner;
import java.text.DecimalFormat;

class CalSideofCone
{
	public static void main(String[] args)
	{
  	Scanner input = new Scanner(System.in);
   	DecimalFormat f2 = new DecimalFormat("0.00");

   	double radius, height, side;

   	System.out.print("Input radius: ");
   	radius = input.nextDouble();

   	System.out.print("Input height: ");
   	height = input.nextDouble();

   	// side = Math.sqrt( height*height + radius*radius);
		side = Math.sqrt( Math.pow(height, 2.) + Math.pow(radius, 2.) );

		System.out.println("side = " + f2.format(side) );

 }
}