import java math

import java.lang.Math.*;

// usage
double radius = 15;
double area = Math.PI * radius * radius;

import static java.lang.Math.sqrt;
public class Demo {
   public static void main(String[] arg) {
      double num = 3.0;
      System.out.println("The number is: " + num);
      System.out.println("The square root of the above number is: " + sqrt(num));
   }
}