import math

a, b, c, d, e = map(int, input().split())
x = (a + b) * (c + d) // math.gcd(a + b, c + d)
li = [int(i % (a + b) < a and i % (c + d) < c) for i in range(x)]
res = e // x * sum(li)
for i in range(e % x):
    res += li[i]
print(res)