#include<iostream>
#include<iomanip>
using namespace std;
#define PI 3.14159
int main(){
    double d,c,s;
    double r;
    cin>>r;
    d=2*r;
    c=2*PI*r;
    s=PI*r*r;
    cout<<fixed<<setprecision(4);
    cout<<d<<" "<<c<<" "<<s<<endl;

}

#include <bits/stdc++.h>
using namespace std;

int main()
{
    double r,d,l,s;
    cin >> r;
    d = 2 * r;
    l = 2 * r * 3.14159;
    s = r * r * 3.14159;
    cout << fixed << setprecision(4) << d << " " << l << " " << s;
    return 0;
}

#include <iostream> #include<iomanip> using namespace std; int main() { double a; cin >> a; double b = 3.14159; cout << fixed << setprecision(4) << 2 * a << " " << fixed << setprecision(4) << 2 * b * a << " " << fixed << setprecision(4) << b * (a * a); return 0; } //泪目,第一次提交,没考虑精度