function dig()
  turtle.dig()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.digUp()
  turtle.digDown()
  turtle.turnRight()
  turtle.dig()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.digUp()
  turtle.digDown()
  turtle.turnLeft()
  turtle.turnLeft()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.dig()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.digUp()
  turtle.digDown()
  turtle.turnRight()
  turtle.turnRight()
  while not turtle.forward() do
    turtle.dig()
  end
  turtle.turnLeft()
end

function torch()
  turtle.select(15)
  turtle.placeDown()
  turtle.select(1)
end

function empty()
  turtle.select(16)
  turtle.placeUp()
  for i = 1, 14 do
    turtle.select(i)
    turtle.dropUp()
  end
  turtle.select(16)
  turtle.select(1)
end

print("torchs in slot 15")
print("ender chest in slot 16")
local x = 0
term.write("how long:")
x = read()
for i = 1, x do
  for i = 1, 5 do
    dig()
  end
  torch()
  turtle.turnRight()
  while not turtle.forward() do
    turtle.dig()
  end
  for i = 1, 4 do
    dig()
  end
  turtle.turnLeft()
  turtle.turnLeft()
  for i = 1, 6 do
    while not turtle.forward() do
      turtle.dig()
    end
  end
  for i = 1, 4 do
    dig()
  end
  turtle.turnLeft()
  turtle.turnLeft()
  for i = 1, 5 do
    while not turtle.forward() do
      turtle.dig()
    end
  end
  turtle.turnLeft()
  empty()
end
dig()