#!/usr/bin/env python3
from typing import *


def solve(a: int, b: int, c: int, d: int, m: int) -> int:
    l = a + c
    r = b + d
    r -= (l - l % m)
    l %= m
    if m - 1 <= r:
        return m - 1
    else:
        return r


# generated by oj-template v4.8.0 (https://github.com/online-judge-tools/template-generator)
def main():
    a, b, c, d, m = map(int, input().split())
    a1 = solve(a, b, c, d, m)
    print(a1)


if __name__ == '__main__':
    main()