Pari want buy expensive chocolate Arya she n coin value ith coin ci the price chocolate k Pari subset coin sum equal k AryaLooking coin question come mind give coin Arya value Arya she jealous do not want Arya lot value so want know value x Arya able x subset coin sum kFormally Pari want know value x exist subset coin sum k subset subset sum x ie exist way pay chocolate Arya able sum x coin