B. Arpa and a list of numberstime limit per test2 secondsmemory limit per test256 megabytesinputstandard inputoutputstandard outputArpa has found a list containing n numbers. He calls a list bad if and only if it is not empty and gcd (see notes section for more information) of numbers in the list is 1.Arpa can perform two types of operations:  Choose a number and delete it with cost x.  Choose a number and increase it by 1 with cost y. Arpa can apply these operations to as many numbers as he wishes, and he is allowed to apply the second operation arbitrarily many times on the same number.Help Arpa to find the minimum possible cost to make the list good.InputFirst line contains three integers n, x and y (1 ≤ n ≤ 5·105, 1 ≤ x, y ≤ 109) — the number of elements in the list and the integers x and y.Second line contains n integers a1, a2, ..., an (1 ≤ ai ≤ 106) — the elements of the list.OutputPrint a single integer: the minimum possible cost to make the list good.ExamplesInput4 23 171 17 17 16Output40Input10 6 2100 49 71 73 66 96 8 60 41 63Output10NoteIn example, number 1 must be deleted (with cost 23) and number 16 must increased by 1 (with cost 17).A gcd (greatest common divisor) of a set of numbers is the maximum integer that divides all integers in the set. Read more about gcd here.
Input4 23 171 17 17 16
Output40
['implementation', 'number theory', '*2100']