2

function avance()
  if turtle.forward() == false then
    turtle.dig()
    turtle.attack()
    sleep(0.1)
    avance()
  end
end


function av(x)

  if tonumber(x) ~= nil and x > 1 then
    for m=1,x do
      avance()
    end
  else avance() end
end

function back()
  if turtle.back() == false then
    turtle.turnLeft()
    turtle.turnLeft()
    turtle.dig()
    turtle.attack()
    turtle.turnLeft()
    turtle.turnLeft()
    sleep(0.1)
    back()
  end
end

function bk(x)
  if tonumber(x) ~= nil and x > 1 then
    for m=1,x do
      back()
    end
  else back() end
end

function upgrade()
  if turtle.up() == false then
    turtle.digUp()
    turtle.attackUp()
    sleep(0.1)
    upgrade()
  end
end

function up(x)
  if tonumber(x) ~= nil and x > 1 then
    for m=1,x do
      upgrade()
    end
  else upgrade() end
end

function down()
  if turtle.down() == false then
    turtle.digDown()
    turtle.attackDown()
    sleep(0.1)
    down()
  end
end

function dn(x)
  if tonumber(x) ~= nil and x > 1 then
    for m=1,x do
      down()
    end
  else down() end
end