from math import gcd
A,B,C,D,E = map(int,input().split())
time,count = 1,1
F = (A+B)*(C+D)//gcd((A+B),(C+D))
while time < F:
  if 0 <= time%(A+B) < A and 0 <= time%(C+D) < C:
    count += 1
  time += 1
ans = count*(E//F)
time = 0
while time < (E%F):
  if 0 <= time%(A+B) < A and 0 <= time%(C+D) < C:
    ans += 1
  time += 1
print(ans)