from math import gcd
a, b, c, d, e = map(int, input().split())
AB = a + b
CD = c + d
L = AB * (CD // gcd(AB, CD))
loop = e // L

cnt = 0
for i in range(L):
    cnt += loop * ((i % AB) < a and (i % CD) < c)

rest = e - L * loop
for i in range(rest):
    cnt += ((i % AB) < a and (i % CD) < c)

print(cnt)