local vars = {...};

height = tonumber(vars[1]);

function Forward()
  while turtle.forward() == false do
    if turtle.detect() == false then
      turtle.attack()
    else
      turtle.dig()
    end
  end
end

function Up()
  while turtle.up() == false do
    if turtle.detectUp() == false then
      turtle.attackUp()
    else
      turtle.digUp()
    end
  end
end

function Down()
  while turtle.down() == false do
    if turtle.detectDown() == false then
      turtle.attackDown()
    else
      turtle.digDown()
    end
  end
end

local currentHeight = 0;

while currentHeight < height do
    Forward();
    Up();
    Up();
    turtle.digUp();
    Down();
end

turtle.turnLeft();
turtle.turnLeft();

while currentHeight >= 0 do
    Down();
    Forward();
    currentHeight = currentHeight - 1;
end