Christmas Gift

Disha works in a company which supplies glass gifts of cubical shape. She is getting orders for it but is puzzled that how she will be able to deliver the glass gifts without any damage. She wants to deliver $N$ glass gifts in another city. The size of each cube is $(1 * 1 * 1)$. She can only deliver the glass cubes by filling them into a single cuboid box. The cost of delivering a cuboid