fn main() {
    let mut xx = String::new();
    std::io::stdin().read_line(&mut xx).ok();
    let xx: Vec<u64> = xx.split_whitespace().flat_map(str::parse).collect();

    let mut max = 0;
    for a in xx[0]..=xx[1] {
        for b in xx[2]..=xx[3] {
            max = max.max((a + b) % xx[4]);
        }
    }

    println!("{max}");
}