import java.util.Scanner;  //Scanner class helps to get input from user
class circle {
  public static void main(String[] args) {
    Scanner s = new Scanner(System.in);  //Scanner class object declaration
    System.out.println("Enter the value of radius: ");
    float r = s.nextFloat();  // takes float input radius from keyboard or user or run time
    float area = (3.14*r*r);
    System.out.println("Area of Circle: "+ area);
  }
}