straight

local args = {...}

local x = tonumber(args[1])

local function checkFuel()
    while turtle.getFuelLevel() < 10 do
        turtle.select(1)
        if turtle.getItemCount(1) < 1 then
            print "Add fuel to slot 1."
            while turtle.getItemCount(1) < 1 do
            end
        end
    turtle.refuel(1)
  end
end

local function digForward()
  checkFuel()
  turtle.dig()
  turtle.forward()
end

local function digUpDown()
    turtle.digUp()
    turtle.digDown()
end

local function placeBlock()
    turtle.select(2)
    if turtle.getItemCount(2) < 1 then
        print "Please place more blocks in slot 2."
        while turtle.getItemCount(2) < 1 do
        end
    end
    turtle.placeDown()
end

local function startup()
    print "Please place fuel in slot 1."
    print "Please place block in slot 2."
    print "Press any key when setup is compele."
    read()
end

startup()
for i=1, x do
    digForward()
    digUpDown()
    placeBlock()
end