O3

 x = read()

    function vor()
    for i=1,3 do
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.digDown()
    turtle.dig()
    end
    turtle.forward()
    turtle.turnRight()
    turtle.forward()
    turtle.turnRight()

    end

    function zurueck()
    for i=1,3 do
    turtle.dig()
    turtle.forward()
    turtle.digUp()
    turtle.digDown()
    turtle.dig()
    end
    turtle.forward()
    turtle.turnLeft()
    turtle.forward()
    turtle.turnLeft()
    end


    function ebene()
    vor()
    zurueck()
    vor()
    end

    function hoch()

    for i=1,4 do
    turtle.forward()
    end

    turtle.turnRight()

    for i=1,3 do
    turtle.forward()
    end

    turtle.turnRight()

    turtle.up()
    turtle.up()
    turtle.up()

    end


    function gs()

    for i=1,x do

    ebene()
    hoch()

    end

    for i=1,4 do
    turtle.forward()
    end

    turtle.turnRight()

    for i=1,3 do
    turtle.forward()
    end

    for i=1,x do
    turtle.down()
    turtle.down()
    turtle.down()
    end

    end

    gs()