Shweta And Her Rakhi (100)

On the eve of Rakshabandhan, Shweta wants to buy a Rakhi for her brother. She visits a shop and finds that there are N Rakhis of different sizes. The shopkeeper tells her that the cost C of a Rakhi is directly proportional to its size. He also tells Shweta that the cost of all the Rakhis is distinct. Shweta is finding it difficult to keep track of the cost of all the Rakhis. So she asks the shopke