using System;

public class Program

{ public static void Main()

    {   Console.WriteLine("wawedi a:");

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

        Console.WriteLine("wawedi b:");

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

        Console.WriteLine("wawedi c:");

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

        double p,s;

        p=(a+b+c)/2;

        s=Math.Sqrt(p*(p-a)*(p-b)*(p-c));

        Console.WriteLine("poluperimetur = {0:F2} lice = {1:F2}",p,s);

    }

}