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