fn read_data() -> (usize, usize, usize, usize, usize) {
    let mut buf = String::new();
    std::io::stdin().read_line(&mut buf).ok();

    let parse_to = |e: &str| -> usize { e.parse().unwrap() };
    let v: Vec<usize> = buf.trim().split_whitespace().map(parse_to).collect();

    (v[0], v[1], v[2], v[3], v[4])
}

fn main() {
    let (a, b, c, d, m) = read_data();
    let mut max_mod = 0;
    for x in a..=b {
        for y in c..=d {
            max_mod = std::cmp::max(max_mod, (x + y) % m);
        }
    }

    println!("{}", max_mod);
}