For a particular operation, the setup time is

$1$

$0$

$$minutes and the run time is

$5$

$0$

$$minutes to produce a standard lot of

$4$

$0$

$$parts$.$ It takes three additional hours to circulate a container of parts after production is completed. The demand rate is

$2$

$0$

$,$

$0$

$0$

$0$

$$parts per month. There are

$1$

$6$

$0$

$$production hours in a month.

a

$.$

$$How many standard containers are needed?

$($

Round your answer up to the next integer.

$)$