using System;

public class Program

{

    public static void Main()

    {

        string s;

        int x;

        double a,b, kvadratlaukums, tainsturislauk;

        Console.WriteLine("Ievadiet skaitli:");

        Console.WriteLine("1-Kvadrats");

        Console.WriteLine("2-Tainsturis");

        Console.WriteLine("3-Rinkis");

        Console.WriteLine("4-Rombs");

        s=Console.ReadLine();

        x=int.Parse(s);

        if(x==1)

        {

            Console.WriteLine("Ievadiet a= ");

            s=Console.ReadLine();

            a=int.Parse(s);

            kvadratlaukums=a*a;

            Console.WriteLine("Atbilde:"+kvadratlaukums);

        }

        else if (x==2)

        {

        Console.WriteLine("Ievadiet a= ");

        s=Console.ReadLine();

        a=int.Parse(s);

        Console.WriteLine("Ievadiet b= ");

        s=Console.ReadLine();

        b=int.Parse(s);

        tainsturislauk=a*b;

        Console.WriteLine("Tains laukums:"+tainsturislauk);

        }

        Math.PI

        //Console.ReadKey();

    }

}