test1

function poloz()
    r = 2
   for h = 1, 4 do
        for c = 1, 4 do
             for i = 1, 20 do
             turtle.forward()
                    kocka()
            end
            turtle.turnRight()
        end
        turtle.up()
   end
end
function kocka()
                        if turtle.detectDown()==false then
                            turtle.select(r)
                                    if turtle.getItemCount( turtle.getSelectedSlot() ) >1 then
                                        turtle.placeDown()
                                        else

                                        turtle.select(r)
                                        r = r + 1
                                        turtle.placeDown()

                                    end
                       end
end

function strecha()
    for a = 1, 20 do

             for i = 1, 20 do
                     kocka()
                 turtle.forward()
              end

          if ((a % 2) == 1) then
            turtle.turnRight()
            kocka()
            turtle.forward()

            turtle.turnRight()
                else
            turtle.turnLeft()
            kocka()
            turtle.forward()

            turtle.turnLeft()
            end


      end


end

function start()
    turtle.refuel(64)
    turtle.forward()
    poloz()
    strecha()
end

start()