using System.Numerics;

public class Program
{
    public static void Main()
    {

        int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] str = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        double d = Math.Pow(num, 2);
        Console.WriteLine(d);
    }
}