#include "iostream"

using namespace std;

int main()

{

double masahat, mohit, shoaa;

const double pi = 3.141593;

cout << " ( shoaa ra vared konid ta masahat va mohit an mohasebeh shavad )\n\n" << " shoaa : ";

cin >> shoaa;

masahat = shoaa * shoaa * pi;

mohit = shoaa * 2 * pi;

cout << " -------------------------\n\n" << " masahat : " << masahat << "\n\n" << " mohit : " << mohit << "\n";

return 0;

}