transport

function up()
 while not turtle.up() do
  sleep(1)
 end
end
function down()
 while not turtle.down() do
  sleep(1)
 end
end
function drop()
 for i=1,15 do
  turtle.select(i)
  if not turtle.dropUp() then
   return
  end
 end
end
function suck()
 for i=1,15 do
  turtle.suck()
 end
end
function check()
 turtle.select(16)
 if turtle.compare() then
  if turtle.getItemCount(15) < 1 then
   suck()
  end
 elseif turtle.detectUp() then
  drop()
 end
end
while true do
 x=0
 while not turtle.detectUp() do
  check()
  up()
 end
 while x < 1 do
  check()
  if turtle.getItemCount(15) > 0 then
   x=1
  else
   down()
  end
  if turtle.detectDown() then
   x=1
  end
 end
end