Akash and Dinner

Akash got his money from CodeChef today, so he decided to have dinner outside. He went to a restaurant having $N$ items on the menu. The $i^{th}$ item on the menu belongs to the *category* $A_i$ and requires $B_i$ time to be cooked. Akash wants to have a *complete meal*. Thus, his meal should have **at least** $K$ **distinct** *categories* of food. The total time required to get all the food