using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SimpleAF
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Zadej polomer");
            double polomer = double.Parse(Console.ReadLine());
            float Pi = (float) Math.PI;
            double obsah = Pi * (polomer * polomer);
            double obvod = 2 * Pi * polomer;
            Console.WriteLine("Obsah je " + obsah + " cm2");
            Console.WriteLine("Obvod je " + obvod + " cm");
            Console.ReadKey();










        }
    }
}