local args = {...}

local l = args[1]
local w = args[2]

function digUp()
    if turtle.detectUp() then
        repeat turtle.digUp() until turtle.up()
        digUp()
        turtle.down()
    end
    return
end

function dig()
    repeat turtle.dig() until turtle.forward()
end

for i = 1, l do
    for b = 1, w do
        dig()
        digUp()
    end
    if i % 2 ~= 0 then 
        turtle.turnLeft()
        dig()
        digUp()
        turtle.turnLeft()
    else
        turtle.turnRight()
        dig()
        digUp()
        turtle.turnRight()
    end
end