#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",s,c);
 
 
return 0;
}
/**************************************************************
	Problem: 1005
	User: zhengzihao
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2076 kb
****************************************************************/