using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Enter figure: ");

        var f1 = "square";

        var f2 = "rectangle";

        var f3 = "circle";

        var f4 = "triangle";

        var figure = Console.ReadLine();

        if (figure == f1)

        {

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

            double area = side * side;

            Console.WriteLine(Math.Round(area, 3));

        }

    }

}