floorSize = 100

currentSlot = 2


function PlaceTorch()
    turtle.select(1)
    turtle.turnRight()
    turtle.turnRight()

    turtle.place()

    turtle.turnRight()
    turtle.turnRight()
    turtle.select(currentSlot)
end

function CheckSlotLevel()
    if (turtle.getItemCount() <= 0) then
        currentSlot = currentSlot + 1
        turtle.select(currentSlot)
    end
end

function BuildRow(torch)
    for i=0,floorSize,1 do
        CheckSlotLevel()
        turtle.placeDown()
        if (torch and (i%5==0)) then
            PlaceTorch()
        end
		turtle.forward()
    end
end

function Build()
    BuildRow(false)
    for i=0,floorSize,1 do
        torch = i%5==0
        BuildRow(torch)
    end
end

turtle.select(currentSlot)
Build()