using System;

public class Program

{

    public static void Main()

    {

        string S;

        double a,b,c,p,laukums;

        Console.WriteLine("a");

        S=Console.ReadLine();

        a=double.Parse(S);

        Console.WriteLine("b");

        S= Console.ReadLine();

        b=double.Parse(S);

        Console.WriteLine("c");

        S=Console.ReadLine() ;

        c=double.Parse(S);

        p=a+b+c;

        laukums=(p*p-a*p-b*p-c);

        Console.WriteLine("perimetrs"+p);

        Console.WriteLine("laukums"+laukums); }}