a,b,c,d,e = map(int,input().split())
u = (a + b) * (c + d)
q = 0
for i in range(u + 1):
    if 0 < i % (a + b) <= a and 0 < i % (c + d) <= c:
        q += 1
ans = q * (e // u)
r = e % u
for i in range(r+1):
    if 0 < i % (a + b) <= a and 0 < i % (c + d) <= c:
        ans += 1
print(ans)