local depth = 0
local pile = 2

local function tryDown()
    if not turtle.down() then
        if not turtle.digDown() then
            return false
        end
        if not turtle.down() then
            return false
        end
    end
    depth = depth + 1
    return true
end

local function tryUp()
    if not turtle.up() then
        if not turtle.digUp() then
            return false
        end
        if not turtle.up() then
            return false
        end
    end
    depth = depth - 1
    return true
end

local function tryForward()
    if not turtle.forward() then
        if not turtle.dig() then
            return false
        end
        if not turtle.forward() then
            return false
        end
    end
    return true
end

local function tryBack()
    if not turtle.back() then
        turtle.turnLeft()
        turtle.turnLeft()
        if not turtle.dig() then
            turtle.turnLeft()
            turtle.turnLeft()
            return false
        end
        turtle.turnLeft()
        turtle.turnLeft()
        if not turtle.back() then
            return false
        end
    end
    return true
end

local function getResources()
    return turtle.getItemCount(2)+turtle.getItemCount(3)+turtle.getItemCount(4)+turtle.getItemCount(5)+turtle.getItemCount(6) - 5
end

local function diveForResources()
    if getResources() > 64 * 3 then
        return false
    end

    while tryDown() do
    end

    while depth > 0 do
        tryUp()
        if depth < 3 and turtle.getItemCount(1) > 1 then
            turtle.select(1)
            turtle.placeDown()
        end
    end
    return true
end

local function towerLayer()
    turtle.select(pile)
    while turtle.getItemCount(pile) <= 10 do
        pile = pile + 1
        turtle.select(pile)
    end
    if (pile > 6) then
        return false
    end
    tryForward()
    for n = 1,4 do
        turtle.place()
        turtle.turnRight()
        tryForward()
        turtle.place()
        turtle.turnLeft()
        turtle.place()
        tryBack()
        turtle.turnRight()
    end
    tryBack()
    return true;
end

local function createTower()
    diveForResources()
    for n = 1,4 do
        tryForward()
        diveForResources()
        turtle.back()
        turtle.turnRight()
    end
    pile = 2
    while towerLayer() do
        tryUp()
    end
    while depth > 0 do
        tryDown()
    end
end

createTower();