import strutils, sequtils

let
    v = stdin.readLine.split.map(parseInt)
    (a, b, c, d, m) = (v[0], v[1], v[2], v[3], v[4])
var ans = 0

for x in countup(a, b):
    for y in countup(c, d):
        ans = max(ans, (x + y) mod m)

echo ans