Get Lowest Free

Chef goes to the supermarket to buy some items. Luckily there's a sale going on under which Chef gets the following offer: - If Chef buys $3$ items then he gets the item (out of those $3$ items) having the lowest price as free. For e.g. if Chef bought $3$ items with the cost $6$, $2$ and $4$, then he would get the item with cost $2$ as free. So he would only have to pay the cost of the other t