Berry Tough Distribution

Smurf forest has V varieties of berries and there are Si number of berries belonging to each variety i(1 i V) collected by Smurfs. Berries belonging to a particular variety are all kept in the same box, i.e. berries of variety Si are kept in box i'th box. Smurfs consists of M family members and the berries collected by the family have to be distributed equally in terms of quantity of berries to e