a = x+1
b = y

function Move(forw)
  repeat
  turtle.forward()
  forw=forw-1
  until forw==0
end

function TurnL(turnw)
    repeat
    turtle.turnLeft()
    turnw=turnw-1
    until turnw == 0
end

function TurnR(turnw)
    repeat
    turtle.turnRight()
    turnw=turnw-1
    until turnw == 0
end

function StartUp()
    Move(4)
    TurnR(1)
    Move(3)
    TurnR(2)
    turtle.down()
end

function GoFarm()
    while b>0 do
        while a>0 do
			turtle.digDown()
			turtle.suckDown()
			turtle.placeDown()
			Move(1)
            a=a-1
        end
		TurnR(2)
		Move(x+1)
		TurnL(1)
		Move(1)
		TurnL(1)
        a=x+1
		b=b-1
    end
end

function Return()
	turtle.up()
	TurnL(1)
	Move(y)
	TurnR(1)
	Move(3)
	TurnL(1)
	Move(4)
	TurnL(2)
end

function Empty()
	slot=2
    repeat
    turtle.select(slot)
    turtle.dropDown()
    slot=slot+1
    until slot > 14
    turtle.select(1)
end

function GoDrop()
	Empty()
    CurSlot = turtle.getItemCount(1)
    turtle.dropDown(CurSlot-2)
	Empty()
end

StartUp()
GoFarm()
Return()
GoDrop()
shell.run("loop")