#!/usr/bin/env python3
import sys

def main():
    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((x + y) % m, ans)
    print(ans)
    return

if __name__ == '__main__':
    main()