#include<bits/stdc++.h>
  using namespace std;
  typedef long long ll;
  typedef pair<int, int> pii;
  #define MP(a,b) make_pair(a,b)
  int main() {
  	ios::sync_with_stdio ( false );
  	double r,d,z,m;
  	cin>>r;
  	d=r*2.0;
  	z=d*3.14159;
  	m=3.14159*r*r;
  	cout<<fixed<<setprecision(4)<<d<<" "<<z<<" "<<m;
  	return 0;
  }