import heapq

def is_ok(K):
    HH = [0]*N
    for i in range(N):
        HH[i]=H[i]-K
    y = Y*B
    j = 0
    while y>0 and j<N:
        d = min(y,HH[j])
        if d>0:
            HH[j]-=d
            y-=d
        j+=1
    return max(HH)<=0

def meguru_bisect(ok, ng):
    while (abs(ok - ng) > 1):
        mid = (ok + ng) // 2
        if is_ok(mid):
            ok = mid
        else:
            ng = mid
    return ok


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

HQ = []
for i in range(N):
    heapq.heappush(HQ,(-H[i],i))
for _ in range(A):
    hi,i = heapq.heappop(HQ)
    H[i]-=X
    heapq.heappush(HQ,(-H[i],i))



print(meguru_bisect(10**9 + 1,0))