using System;
public class Program
{
public static void Main()
int r;
Console.WriteLine("Enter Radius :");
r= Convert.ToInt32(Console.ReadLine());
Radius(r);
}
static void Radius(int n)
int temp = 2 *n;
double p = 3.14;
double res=temp*p;
Console.WriteLine("Area of Circle is = : " + res);