FastApproxDig

local fwd, right, up = ...
fwd, right, up = tonumber(fwd), tonumber(right), tonumber(up)

local function checkFull()
    while turtle.getItemCount(16) > 0 do
        write "Please clear inventory"

        read()
    end
end

local j = 1
local function digLevel()
    for i = 1, right do
        for i = 1, fwd do
            turtle.digDown()
            turtle.digUp()
            turtle.dig()
            turtle.forward()
            checkFull()
        end
        if i ~= right then
            local dir = turtle.turnRight
            if j % 2 == 0 then dir = turtle.turnLeft end
            dir()
            turtle.dig()
            turtle.forward()
            dir()
            j = j + 1
        end
    end
    while turtle.getFuelLevel() < 500 do
        write "Fuel low"
        read()
        turtle.refuel(1)
    end
end

for i = 1, up, 3 do
    digLevel()
    for i = 1, 3 do
        turtle.digUp()
        turtle.up()
    end
    turtle.turnRight()
    turtle.turnRight()
end