n, a, b, x, y = map(int,input().split())
h = list(map(int,input().split()))
def solve(n, a, b, x, y, h):
    from collections import deque
    def check(k):
        import heapq
        h2 = [0] * n
        for i in range(n):
            h2[i] = min(0, k - h[i])
        heapq.heapify(h2)       
        
        for i in range(a):
            now = heapq.heappop(h2)
            now = min(0, now + x)
            heapq.heappush(h2, now)
        if sum(h2) >= - 1 * b * y:
            return True
        else:
            return False

    ok = 10 ** 9
    ng = -1

    while abs(ok - ng) > 1:
        mid = (ok + ng) // 2
        if check(mid):
            ok = mid
        else:
            ng = mid
    return ok
print(solve(n, a, b, x, y, h))