Integers number$\_$of$\_$pieces, required$\_$groups, and invalid$\_$groups are read from input. If number$\_$of$\_$pieces is less than $15,$ then

add $2$ to required$\_$groups. Otherwise, add $4$ to invalid$\_$groups.

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number$\_$of$\_$pieces $=$ int input $())$

required$\_$groups $=$ int $($input $())$

invalid$\_$groups $=$ int input $()$