function hasItems()
    if (turtle.getItemCount(1) > 0) then
        return true
    end

    if (turtle.getItemCount(2) > 0) then
        return true
    end

    if (turtle.getItemCount(3) > 0) then
        return true
    end

    return false
end

while true do
    if (hasItems()) then
        turtle.select(1)
        turtle.drop()

        turtle.select(2)
        turtle.drop()

        turtle.select(3)
        turtle.drop()
    end
    os.sleep(1)
end