c# - Find the closest higher number that has a given divisor -

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i have allocate items customers. in allocation algorithm customers should have specific minimum, before allocate remaining items.

some of these items pre-picked. these pre-picked items @ least 1 container quantity given. two.

i need efficient algorithm find minimum value above given minimum value per customer , can divided @ least 1 container quantity without remainder.

here minimalistic code better understanding:

int  containerqty1;      int? containerqty2;     // can null int customerminimum;   int minimumtoget;

in example, minimumtoget should have higher value customerminimum, has divided without remainder containerqty1 or containerqty2.

given 2 numbers, m , d, can construct smallest number x above m such d divides x first adding d m, , subtracting remainder of division of sum d, i.e.

int x = (m+d) - ((m+d) % d);

example: m = 200, d = 13. looking smallest multiple of 13 above 200.

int x = (200+13) - ((200+13) % 13) = 213 - 5 = 208;

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