#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin>>n;
    printf("%.2f",3.14*n*2.0);
    cout<<endl;
    printf("%.2f",3.14*n);
	return 0;
}

/**************************************************************
	Problem: 1005
	User: duyahan
	Language: C++
	Result: Wrong Answer
****************************************************************/