import java.util.Scanner;
public class surfaceAreaOfSphere
{
    public static void main(String args[])
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter radius of circle");
        double r=sc.nextDouble();
        double pi=22/7;
        /*Formula of surface area of sphere =4*pi* (radius of sphere)^2)*/
        double area=4*pi*r*r;
        System.out.println("surface Area of sphere="+area);
     }
}