mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    a, b, c, d, m = map(int, input().split())
    ans = 0
    for x in range(a, b+1):
        for y in range(c, d+1):
            ans = max(ans, (x+y)%m)
    print(ans)


if __name__ == '__main__':
    main()