#include <iostream>
#define PI 3.141592653589
using namespace std;
int main()
{ int r;
float l,s;
cin>>r;
l=PI*2*r;
s=PI*r*r;
cout<<l<<'\t'<<s<<endl;
}
#include <iostream>
#define PI 3.141592653589
using namespace std;
int main()
{ int r;
float l,s;
cin>>r;
l=PI*2*r;
s=PI*r*r;
cout<<l<<'\t'<<s<<endl;
}