break

function refuel(requireFuel)
 currentFuel = turtle.getFuelLevel()

 diffFuel = requireFuel - currentFuel

 requireCoal = math.ceil(diffFuel / 80)

 cnt = turtle.getItemCount(16)

 if cnt < requireCoal then
  print("require coal: " .. requireCoal)
  return false
 end

 turtle.select(16)
 turtle.refuel(requireCoal)

 return true
end

function shiftRight()
 turtle.turnRight()
 turtle.forward()
 turtle.turnLeft()
end

function backLeft(width)
 turtle.turnLeft()

 for i = 1, width do
  turtle.forward()
 end

 turtle.turnRight()
end

function backDown(height)
 for i = 1, height do
  turtle.down()
 end
end

function getBlock()
 if turtle.detect() then
  for i = 1, 16 do
   if turtle.getItemCount(i) == 0 then
    turtle.dig()
    return i
   end

   turtle.select(i)

   if turtle.compare() then
    turtle.dig()
    return i
   end
  end
 else
  return 0
 end
end

write("Enter Filename\n")
path = read()

if path == "" then
 return
end

write("Enter Width\n")
width = read()
write("Enter Height\n")
height = read()
write("Enter Depth\n")
depth = read()

if refuel(((((width * 2) + 2) * height) + 1) * depth) ~= true then
 return
end

f = fs.open(path, "wb")

f.write(tonumber(width))
f.write(tonumber(height))
f.write(tonumber(depth))

for z = 1, depth do
 for y = 1, height do
  for x = 1, width do
   f.write(getBlock())
   shiftRight()
  end

  backLeft(width)
  turtle.up()
 end

 backDown(height)
 turtle.forward()
end

f.close()