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