print("How many section to build?")
local number = read()
for i = 1,number/4 do
    if turtle.getFuelLevel() < 160 then
        turtle.select(16)
        if turtle.refuel(10) then
        else
            turtle.select(15)
            turtle.refuel(10)
        end
    end

    function fdown()
        turtle.forward()
        turtle.down()
    end

    function chkblock()
        if turtle.detectDown() then
        else
            turtle.select(5)
            turtle.placeDown()
        end
    end

    function upplace()
        turtle.up()
        turtle.select(1)
        turtle.placeDown()
    end
    function torchplace()
        turtle.turnRight()
        turtle.forward()
        chkblock()
        turtle.back()
        turtle.select(9)
        turtle.place()
        turtle.turnLeft()

    end
    for i = 1,4 do
        upplace()
        fdown()
        chkblock()
        upplace()
        fdown()
        chkblock()
        upplace()
        fdown()
        chkblock()
        torchplace()


    end


end