If the integers capacityand numItemsis your drawer capacity (53 in the example) and the total number of items you have, use the following two calculations:
int numBoxes = numItems / capacity;
int remainder = numItems % capacity;
(numBoxes) (remainder), , 0.
: , .NET Math.DivRem.
int remainder;
int numBoxes = Math.DivRem( numItems, capacity, out remainder );
.