#include <bits/stdc++.h>
using namespace std;
int main(){
    int r;
    float s,c;
    scanf("%d",&r);
    s=3.1415926*r*r;
    c=2*3.1415926*r;
    printf("%.2f\n%.2f",s,c); 
}
/**************************************************************
	Problem: 1005
	User: HUANGYIBO
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2076 kb
****************************************************************/