tun3

local length = 0
term.write("How far?")
length = toNumber(read())

for i = 1, length do
 while not turtle.forward() do
  turtle.dig()
 end
 turtle.digUp()
 turtle.digDown()
 turtle.turnLeft()
 turtle.dig()
 turtle.forward()
 turtle.digUp()
 turtle.digDown()
 turtle.turnLeft()
 turtle.turnLeft()
 turtle.forward()
 turtle.dig()
 turtle.forward()
 turtle.digUp
 turtle.digDown()

 if j == 5
  turtle.placeUp(1)
 end
 turtle.turnLeft()
 turtle.forward()
 turtle.turnRight()
 turtle.suckDown()
 if turtle.getItemCount(16) > 0
  break
 i = i+1
 j = j+1
end

turtle.turnLeft()
turtle.turnLeft()
while i >= 0 do
 turtle.forward()
 i = i-1
end