def main():
    A, B, C, D, E = map(int, input().split())
    dur = (A + B) * (C + D)
    num = E // dur
    rem = E % dur
    n = calc(A, B, C, D, dur) * num
    n += calc(A, B, C, D, rem)
    print(n)
def calc(A, B, C, D, E):
    n = 0
    for t in range(E):
        if t % (A + B) < A and t % (C + D) < C:
            n += 1
    return n
main()