Staircase

levels = tonumber(read())
print(levels)

function forward(amount)
  for i = 1, amount or 1 do
    dig()
    turtle.forward()
  end
end

function up(amount)
  for i = 1, amount or 1 do
    digUp()
    turtle.up()
  end
end

function dig()
  while turtle.detect() do
    turtle.dig()
    os.sleep(0.5)
  end
end

function digUp()
  while turtle.detectUp() do
    turtle.digUp()
    os.sleep(0.5)
  end
end

for i = 1, levels do
  forward()
  dig()
  if(i % 4 == 1 and i > 1) then
    turtle.place()
    turtle.turnLeft()
  end
  turtle.digDown()
  up()
  digUp()
end