#include<bits/stdc++.h>
using namespace std;
int main()
{
    double r;
    cin>>r;
    cout<<fixed<<setprecision(4)<<2*r<<" ";
    cout<<fixed<<setprecision(4)<<2*3.14159*r<<" ";
    cout<<fixed<<setprecision(4)<<3.14159*r*r;
    return 0;
}