from sys import stdin


def main():
    input = lambda: stdin.readline()[:-1]
    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)


main()