#include #include using namespace std; int main() { double r,n,a; cin>>r; n=3.14159; a=2; cout<<fixed<<setprecision(4)<<ar<<" "<<anr<<" "<<nr*r; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
    double r, d, c, a;
    double pi = 3.14159; 
    cin >> r;
    d = 2 * r;
    c = 2 * pi * r;
    a = pi * r * r;
    cout << fixed << setprecision(4);
    cout << d << " " << c<< " " << a << endl;
    return 0;
}