using System;

public class Program

{

    public static void Main()

    {

        string square = "square";

        string rectangle = "rectangle";

        string circle = "circle";

        string triangle = "triangle";

        double pi = 3.14;

        Console.WriteLine("Napishete figura. ");

        string figure = Console.ReadLine();

        if (figure == square)

        {

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

            double aa = a * a;

            Console.WriteLine("liceto e = {0}",aa);

        }

        else if (figure == rectangle)

        {

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

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

            double ab = a * b;

            Console.WriteLine("liceto e = {0}",ab);

        }

        else if (figure == circle)

        {

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

            double aa = a * pi;

            Console.WriteLine("liceto e = {0}",aa);

        }

    }

}