import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class Main{
	public static void main(String[] args) throws IOException {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		String r=br.readLine();
		double i=Double.parseDouble(r);
		double p =Math.PI;
		double s=i*i*p;
		double l=p*2*i;
		System.out.printf("%f %f",s,l);
	
	}
	}
/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