#include<bits/stdc++.h>
using namespace std;
int main(){
    double r,d,c,s,yzl=3.14159;
    cin>>r;
    cout<<fixed<<setprecision(4)<<r*2.0<<" ";
    cout<<fixed<<setprecision(4)<<r*2.0*yzl<<" ";
    cout<<fixed<<setprecision(4)<<yzl*(r*r);
return 0;
}