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

namespace ostad_daneshj00
{
class Program
{
public const double p = 3.14;
static public int r=0;
static void shoa()
{
Console.Write("enter r=");
r=int.Parse(Console.ReadLine());


}
static double mohit(int a)
{
return 2*a*p;
}
static double masahat(int b)
{
return b*b*p;
}
static void Main(string[] args)
{
shoa();
Console.Write("mohit={0}/n",mohit(r));
Console.Write("masahat={0}/n",masahat(r));

}
}
}