def main():

    n, a, b, x, y = map(int, input().split())
    H = list(map(int, input().split()))
    import heapq

    def is_ok(k):
        q = [0]*n
        for i, h in enumerate(H):
            q[i] = min(0, k-h)
        heapq.heapify(q)
        for i in range(a):
            v = heapq.heappop(q)
            heapq.heappush(q, min(0, v+x))
        return  -sum(q) <= y*b

    ng = -1
    ok = max(H)
    while ng+1<ok:
        c = (ng+ok)//2
        if is_ok(c):
            ok = c
        else:
            ng = c
    print(ok)

if __name__ == '__main__':
    main()