#include <bits/stdc++.h>
using namespace std;
int main(){
	const double pai=3.1415926;
	double r;
	cin>>r;
	printf("%.2lf\n%.2lf",r*r*pai,r*2*pai);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: zhouhongyi
	Language: Java
	Result: Compile Error
****************************************************************/