#include<bits/stdc++.h>
using namespace std;
int main()
{int r;
 scanf("%d",&r);
 float c,s;
 c=2*3.1415926*r;
 s=r*r*3.1415926;
 printf("%.2f\n%.2f",c,s);


return 0;
}

/**************************************************************
	Problem: 1005
	User: cx002
	Language: C++
	Result: Wrong Answer
****************************************************************/