#include<bits/stdc++.h>
using namespace std;
int main(){
	int r;
	float s,c;
	cin>>r;
	s=r*r*3.14;
	c=r*2*3.14;
	printf("%.2f\n",s);
	printf("%.2f\n",c);
}
/**************************************************************
	Problem: 1005
	User: lvrenxiang
	Language: C++
	Result: Wrong Answer
****************************************************************/