Seven segment display 0-999 up down counter

I am building a up down counter using push buttons counting from 0-999 normally my program is working but have to make some modifications like
From 40-100 it will count with a 5 increments i.e 40-45-50-55 till 100
And from 100-999 with a 10 digit increments like 100-110-120-130 and so on

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