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");
}