M1, S1, M2, S2, N = map(int, input().split())

dp = [0] * (N + sum([M1, S1, M2, S2]))

i = 0
while i <= N:
    for j in range(M1):
        dp[i] += 1
        i += 1
    for j in range(S1):
        i += 1

i = 0
while i <= N:
    for j in range(M2):
        dp[i] += 1
        i += 1
    for j in range(S2):
        i += 1

print(dp[:N].count(2))