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