st

steps = tonumber(io.read())

local function returnTunnelLeft()
  turtle.turnLeft()
  turtle.turnLeft()
  for i = 1, 5 do
    turtle.forward()
  end
  turtle.turnLeft()
end

local function returnTunnelRight()
  turtle.turnRight()
  turtle.turnRight()
  for i = 1, 5 do
    turtle.forward()
  end
  turtle.turnRight()
end

local function tunnelLeft()
  turtle.turnLeft()
  for i = 1, 5 do
    turtle.dig()
    turtle.forward()
    turtle.digDown()
  end
end

local function tunnelRight()
  turtle.turnRight()
  for i = 1, 5 do
    turtle.dig()
    turtle.forward()
    turtle.digDown()
  end
end

local function tunnel()
  for i = 1, 3 do
    turtle.dig()
    turtle.forward()
    turtle.digDown()
  end
  tunnelLeft()
  returnTunnelLeft()
  tunnelRight()
  returnTunnelRight()
end

while steps > 0 do
  tunnel()
  steps = steps - 1
end