###
 #    author:  Sooh
 #    created: 03.09.2021 21:20:28
###
import sys
input = sys.stdin.readline
#sys.setrecursionlimit(10001001)

def main(): 
    a, b, c, d, m = map(int, input().split())
    ans = -1
    for i in range(a, b + 1):
        for j in range(c, d + 1):
            ans = max(ans, (i + j) % m)
    print(ans)

if __name__ == '__main__':
    main()