#include<iostream>
#include<iomanip>
using namespace std;
int main(){
    const double a = 3.14159;//const修饰的变量或对象运行过程中不能修改。
    double r, diameter, circumference, area;
    cin>>r;
    diameter = 2*r;
    circumference = 2*r*a;
    area = a*r*r;
    cout<<fixed<<setprecision(4)<<diameter<<" "<<circumference<<" "<<area<<endl;
    return 0;
}