#include <iostream>
using namespace std;
int main(){ 
    double a,b,c, m;
    cin>>m;
    a=2* m;
    b=2*m*3.14159;
    c=m*m*3.14159;;
    printf("%.4lf",a);
    cout << " " ;
    printf("%.4lf",b);
    cout << " " ;
    printf("%.4lf",c);
    return 0;
}