#include <iostream>
#include <math.h>
using namespace std;

int main()
{
    int r;
    cout << "Podaj promien: ";
    cout << endl;
    r=12;

    for(int z=0; z<r; z++){
        for(int x=0; x<r; x++)
        {
        if( x*x + z*z < r)
           cout << " ";
            else
            cout << "x";
        }

        for(int x=r; x>=0; x--)
        {
        if( x*x + z*z < r)
           cout << " ";
            else
            cout << "x";
        }
        cout << endl;

    }

    for(int z=r; z>=0; z--){
        for(int x=0; x<r; x++)
        {
        if( x*x + z*z < r)
           cout << " ";
            else
            cout << "x";
        }

        for(int x=r; x>=0; x--)
        {
        if( x*x + z*z < r)
           cout << " ";
            else
            cout << "x";
        }
        cout << endl;

    }

    return 0;
}