#include<bits/stdc++.h>
using namespace std;
int main(){
    int r;
    float s,c;
    cin>>r;
    s=3.14*r*r;
	c=3.14*r*2;
	printf("%.2f\n",s);
	printf("%.2f\n",c);
	 
	

	return 0;
}
 
/**************************************************************
	Problem: 1005
	User: fuyijun
	Language: C++
	Result: Wrong Answer
****************************************************************/