using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Console.WriteLine("Nhap 2 canh goc vuong");

        int b=Convert.ToInt32(Console.ReadLine());

        int c=Convert.ToInt32(Console.ReadLine());

        double S=Math.Round(0.5*(b*c),2);

        double a=Math.Round(Math.Sqrt((b*b)+(c*c)),2);

        Console.WriteLine("Dien tich tam giac: "+ S);

        Console.Write("Do dai canh huyen: "+ a);

    }

}