using System;

public class Program

{

    public static void Main()

    {

    Console.WriteLine("please enter a segment;");

        double a= double.Parse(Console.ReadLine());

        Console.WriteLine("please enter a segment: ");

        double b= double.Parse(Console.ReadLine());

        double c2= Math.Pow(a,2)+ Math.Pow(b,2);

        double c= Math.Sqrt(c2);

        Console.WriteLine("c= " + c);

    }

}