using System;

public class Program

{

    public static void Main()

    {

        double a, b, c, p;

        Console.Write("a= ");

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

        Console.Write("b= ");

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

        Console.Write("c= ");

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

        p=a+b+c;

        if (a>0&&b>0&&c>0&&a+b>c&&b+c>a&&a+c>b) p=a+b+c;

        Console.Write("p= "+p);

        else

            Console.Write("Няма такъв триъгълник");

    }

}