#include <bits/stdc++.h>
using namespace std;
int main(){
    int r;
    float s,m;
    cin>>r;
    s=r*r*3.1415926;
    m=2*3*3.1415926*r;
    printf("%.2f\n",s);
    printf("%.2f",m);
}
/**************************************************************
	Problem: 1005
	User: wngjinming
	Language: C++
	Result: Wrong Answer
****************************************************************/