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


def solve(k):
    task = [min(k-h, 0) for h in H]
    task.sort()
    S = -sum(task)
    for _ in range(A):
        v = -hq.heappop(task)
        if v >= X:
            S -= X
            v -= X
        else:
            S -= v
            v = 0
        hq.heappush(task, -v)
    return S <= B*Y


ng, ok = -1, 10**9
while ok-ng > 1:
    m = (ng+ok)//2
    if solve(m):
        ok = m
    else:
        ng = m

print(ok)