#include <iostream>
#include <iomanip>//输入输出控制器
using namespace std;
int main() 
{	
	double r;
	cin>>r;
	double zj,zc,mj;
	zj=r*2;
	zc=2*3.1415926*r;
	mj=3.1415926*r*r;
	cout<<fixed<<setprecision(4)<<zj<<" "<<zc<<" "<<mj;
	return 0;
}