mod = 1000000007
eps = 10**-9


def main():
    import sys
    from heapq import heappush, heappop, heapify
    input = sys.stdin.readline

    N, A, B, X, Y = map(int, input().split())
    H = list(map(int, input().split()))

    ok = sum(H)
    ng = -1
    mid = (ok + ng) // 2
    while ok - ng > 1:
        HH = [max(0, h - mid) for h in H]
        pq = []
        for i, h in enumerate(HH):
            pq.append((-h, i))
        heapify(pq)
        AA = A
        while AA and pq:
            AA -= 1
            h, i = heappop(pq)
            h = -h
            HH[i] = max(0, HH[i] - X)
            if h - X > 0:
                heappush(pq, (-(h - X), i))
        if sum(HH) <= B * Y:
            ok = mid
        else:
            ng = mid
        mid = (ok + ng) // 2
    print(ok)


if __name__ == '__main__':
    main()