n = int(input()) a = [0] + list(map(int, input().split())) b, c = map(int, input().split()) sum = 0 for i in range(1, n+1): a[i] -= b sum += 1 if a[i] > 0: sum += a[i] // c if a[i] % c != 0 : sum += 1 print(sum)