Circumference of circle

public class Solution {
    public static void main(String[] args) {
        Scanner ip = new Scanner(System.in);
        System.out.print("Enter radius: ");
        double radius = ip.nextDouble();
        double circumference = 2 * 3.14 * radius;
        System.out.printf("Circumference is %.3f", circumference);
        ip.close();
    }
}