on way home Karen decide stop supermarket buy grocery she need buy lot good student budget limit in fact spend b dollarsThe supermarket sell n good the ith good buy ci dollar of course good buy oncelately supermarket try increase business Karen loyal customer give n coupon if Karen purchase ith good use ith coupon decrease price di of course coupon buying correspond goodthere constraint coupon for i2 order use ith coupon Karen use xith coupon mean coupon satisfy requirement couponKaren want know follow what maximum number good buy exceed budget b