local tArgs = { ... }
local dis = tonumber(tArgs[1])

g = 1
st = 5


-- Functions

function turnaround()
 turtle.turnRight()
 turtle.turnRight()
end

function placedown(item)
 if (turtle.detectDown() == true) then
  turtle.digDown()
 end
 turtle.select(item)
 turtle.placeDown()
end

function placefront(item)
 if (turtle.detect() == true) then
  turtle.dig()
 end
 turtle.select(item)
 turtle.place()
end

function placerow()
 placefront(st)
 checkst(st)
 placedown(gr)
 checkgr(gr)
 turnaround()
 turtle.forward()
 placedown(gr)
 checkgr(gr)
 turtle.forward()
 placedown(gr)
 checkgr(gr)
 placefront(st)
 checkst(st)
 turnaround()
 turtle.forward()
 turtle.turnLeft()
end

function checkgr(item)
 if (turtle.getItemCount(item) == 1) then
  if (gr == 4) then
   print "Out of Gravel"
  else
   gr = gr + 1
  end
 end
end

function checkst(item)
 if (turtle.getItemCount(item) == 1) then
  if (st == 8) then
   print "Out of Stairs"
  else
   st = st + 1
  end
 end
end

-- Main Script

for i=1, 2 do
 turtle.forward()
 turtle.turnRight()
 turtle.forward()
 placerow()
end
print("Code Terminated")