num_const=0
num=0
depth_const=2
length_const=16
width_const=5
halflength=0
level=18
depth=0
width=0
length=0
temp=0
function EVEN_ODD()
  temp=length_const
  if temp%2==1 then
    length_const=length_const-1
    halflength_const=length_const/2
  else
    halflength_const=length_const/2
  end
end
function MOVE_FORWARD(slot)
  turtle.select(slot)
  while not turtle.forward() do
    turtle.attack()
    turtle.dig()
  end
  if turtle.getItemSpace(slot)>30 then
    turtle.placeDown()
    return(slot-1)
  else
    turtle.placeDown()
    return(slot)
  end
end
function ONE_LINE(sslot)
  while width ~= width_const do
    sslot=MOVE_FORWARD(sslot)
    sslot=sslot+1

    width=width+1
  end
  width=0
  return(sslot)
end
function RIGHT()
  turtle.turnRight()
  sslot=MOVE_FORWARD(sslot)
  turtle.turnRight()
end
function LEFT()
  turtle.turnLeft()
  sslot=MOVE_FORWARD(sslot)
  turtle.turnLeft()
end
function ONE_LAYER()
  sslot=1
  while length ~= length_const do
    sslot=MOVE_FORWARD(sslot)
    sslot=sslot+1
    length=length+1
  end
  turtle.turnLeft()
  while halflength ~= halflength_const do
    sslot=ONE_LINE(sslot)
    LEFT()
    sslot=ONE_LINE(sslot)
    RIGHT()
    halflength=halflength+1
  end
  length=0
  halflength=0
  turtle.turnRight()
end
function UP()

  while not turtle.up() do
    turtle.attackUp()
  end
end
function DOWN()
  while not turtle.down() do
    turtle.attackDown()
    turtle.digDown()
  end
end
function TURN()
  turtle.turnLeft()
  turtle.turnLeft()
end

function DROP_ALL()
  space=1
  while space<17 do
    turtle.select(space)
    turtle.drop()
    space=space+1
  end
end
function GET_TO_START()
  num=0
  turtle.turnLeft()
  while num ~= num_const do
    if level == 0 then
      while not turtle.forward() do
        turtle.attack()
        turtle.dig()
      end
    else
      while not turtle.forward() do
        sleep(1)
      end
    end
    num=num+1
  end
  turtle.turnRight()
  depth=level
  while depth~=0 do
    DOWN()
    depth=depth-1
  end
end
function RETURN_AND_REFUEL()
  depth=0
  temp=level
  while depth ~= temp do
    UP()
    depth=depth+1
  end
  while not turtle.up() do
    sleep(1)
  end
  if num_const~=0 then
    while not turtle.up() do
      sleep(1)
    end
  end
  turtle.turnRight()
  while num ~= 0 do
    while not turtle.forward() do
      sleep(1)
    end
    num=num-1
  end
  if num_const ~= 0 then
    while not turtle.down() do
      sleep(1)
    end
  end
  if turtle.getFuelLevel()<1000 then
    turtle.turnRight()
    turtle.suck()
    turtle.refuel()
    TURN()
  else
    turtle.turnLeft()
  end
  while not turtle.down() do
    sleep(1)
  end
  GET_TO_START()
  level = level+1
end
function START()
  --print("enter width")
  --width_const=tonumber(read())
  --if width_const<=1 then
  --    width_const=2
  --    print("width can't be less then 2. Now it is 2.")
  --end
  print("enter depth")
  depth_const=tonumber(read())
  print("enter turt number")
  num_const=tonumber(read())
  num_const=num_const*11
  print("enter level")
  level=tonumber(read())
  if turtle.getFuelLevel() <1000 then
    TURN()
    turtle.suck()
    turtle.refuel()
    TURN()
  end
end
START()
EVEN_ODD()
DOWN()
GET_TO_START()
--depth_const = level+depth_const
while level~=depth_const do
  ONE_LAYER()
  RETURN_AND_REFUEL()
end