#include <bits/stdc++.h>
using namespace std;
int main(){
   int r; 
   const float PI=3.1415926;
   cin>>r;
   float s=PI*r*r;
   float c=PI*r*2;
   printf("%.2f\n%.2f",s,c);
return 0;
}
/**************************************************************
	Problem: 1005
	User: lijinkai
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/