prueba

local height = 0
local start = 0

local function fuel()
    if turtle.getFuelLevel() < 100 then
        turtle.select(15)
        numero = turtle.getItemCount(15)
        if numero == 1 then
            toSurface()
            print "error"
            error()
        else
            turtle.refuel(numero-1)
            fuel()
        end
    end
end

function toSurface()
    turtle.select(4)
    while height < start do
        while turtle.detectUp() do
            if turtle.compareUp() then
                suckChestUp()
            end
            turtle.digUp()
        end
        turtle.up()
        height = height+1
    end
end

function inventoryFull()
    local exit = true
    for i=1, 16 do
        if turtle.getItemCount(i) == 0 then
            exit = false
        end
    end
    return exit
end

function suckChestUp()
  repeat
    if inventoryFull() then
        print "pru"
        turtle.digDown()
        turtle.select(16)
        turtle.placeDown()
        for i=5, 14 do
            turtle.select(i)
            turtle.dropDown()
        end
        sleep(5)
        turtle.select(16)
        turtle.digDown()
        turtle.select(4)
        suckChestUp()
    else
     salida =  turtle.suckUp()
    end
    until salida == false
end

prueba = tonumber(read())
start = prueba
height = prueba-4
fuel()