Derevo

a, k, b, m, x = map(int, input().split())

def check(d):
    total_a = a * (d - d // k)
    total_b = b * (d - d // m)
    return (total_a + total_b) >= x

l = 0
r = x

while r - l > 1:
    d = l + (r - l) // 2
    if check(d):
        r = d
    else:
        l = d

print(r)