A, B, C, D, E = map(int,input().split())
S = E//((A+B)*(C+D))
T = E%((A+B)*(C+D))
ans = 0
temp = 0
for t in range((A+B)*(C+D)):
    if t%(A+B) < A and t%(C+D) < C:
        ans += 1
        if t < T:
            temp += 1
print(ans*S+temp)