from math import gcd

a, b, c, d, e = map(int, input().split())
loop = (a + b) * (c + d) // gcd(a + b, c + d)
tmp = [False] * loop
for i in range(loop):
    if i % (a + b) < a and i % (c + d) < c:
        tmp[i] = True

ans = e // loop * tmp.count(True)
for i in range(e % loop):
    if tmp[i]:
        ans += 1
print(ans)