from math import lcm
from itertools import accumulate

A, B, C, D, E = map(int, input().split())

sz = lcm(A+B, C+D)
xs = [0] * sz
for i in range(sz):
    p = i % (A + B)
    q = i % (C + D)
    xs[i] = int((p < A) and (q < C))

acc = list(accumulate(xs))
d, m = divmod(E-1, sz)
ans = d * acc[-1] + acc[m]
print(ans)