import itertools


def main():
    a, b, c, d, m = map(int, input().split())

    ans = 0
    for x, y in itertools.product(range(a, b + 1), range(c, d + 1)):
        ans = max(ans, (x + y) % m)
    print(ans)


if __name__ == "__main__":
    main()