import math
A,B,C,D,E = map(int,input().split())
AB = A+B
CD = C+D
gcd = math.gcd(AB,CD)
lcm = (AB*CD)//gcd
cnt = 0
for i in range(1,lcm+1):
    if (i-1)%AB < A and (i-1)%CD < C:
        cnt += 1
ans = (E // lcm) * cnt
rm = E % lcm
for i in range(1,rm+1):
    if (i-1)%AB < A and (i-1)%CD < C:
        ans += 1
print(ans)