#include<iostream>
#include<cstdlib>
using namespace std;
int main(){
	double banjin,zhijin,zhouchang,mianji,pi = 3.14159;
    scanf("%lf" , &banjin );
    zhijin = banjin*2;
    zhouchang = pi*2*banjin;
    mianji = pi*banjin*banjin;
    printf("%.4lf %.4lf %.4lf" , zhijin,zhouchang,mianji);
	return 0;
}