#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;
}

#include<bits/stdc++.h> using namespace std; int main() { double r; cin>>r; double d=2r; double c=23.14159r; double s=3.14159r*r; cout<<fixed<<setprecision(4)<<d<<" "<<c<<" "<<s; return 0; }

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