import java.util.*;

class Main {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		double r = s.nextDouble();
		double a = r*r*Math.PI;
		String c = String.format("%.6f",a);
		double b = r*2*Math.PI;
		String d = String.format("%.6f",b);
		
		System.out.println(c+" "+d);
	}
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz