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