import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DecimalFormat;

public class Main {
	public static void main(String[] args)throws IOException{
		InputStreamReader isr = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(isr);
        double f , x , h;
        	String list = br.readLine();
        	x = Double.parseDouble(list);
        	DecimalFormat df = new DecimalFormat("0.000000");
        	f = x * x * Math.PI;
        	h = 2 * x * Math.PI;
            System.out.println(df.format(f) + " " + df.format(h));
	}

}
/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