term.clear()
term.setCursorPos(1,1)
local z = 0

local function smartForward()
  while not turtle.forward() do
        turtle.dig()
        turtle.attack()
  end
  turtle.digUp()
  z = z+1
end

local function smartForwardNo()
  turtle.placeDown()
  while not turtle.forward() do
        turtle.dig()
        turtle.attack()
  end
end

local function smartTorch()
  while not turtle.placeUp() do
        if turtle.detectUp() then
                  turtle.digUp()
        end
  end
end

local function torch()
  if z % 8 == 0 then
        turtle.digUp()
        turtle.turnLeft()
        turtle.up()
        turtle.place()
        turtle.down()
        turtle.placeDown()
        turtle.select(16)
        smartTorch()
        turtle.turnRight()
        turtle.select(1)
  end
end

print("How Far?")
x = read()
y = tonumber(x)
tunnel = 0
while true do
  for all = 1, y do

        smartForward()

        torch()

  end

   turtle.turnLeft()
   turtle.turnLeft()
  for i = 1, y do
        smartForwardNo()
  end

  tempvar = tunnel*3
  tunnel=tunnel+1
  turtle.turnRight()

  for i = 1, tempvar do
        smartForwardNo()
  end


  for j = 2, 15 do
        turtle.select(j)
        turtle.drop()
  end

  turtle.turnRight()
  turtle.turnRight()

  for i=1, tempvar do
         smartForwardNo()
  end

  smartForwardNo()
  turtle.digUp()
  smartForwardNo()
  turtle.digUp()
  smartForwardNo()
  turtle.digUp()
  turtle.turnLeft()
  z = 0
end