fn main() {
    let mut abcdm = String::new();
    std::io::stdin().read_line(&mut abcdm).ok();
    let abcdm: Vec<usize> = abcdm.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let a = abcdm[0];
    let b = abcdm[1];
    let c = abcdm[2];
    let d = abcdm[3];
    let m = abcdm[4];

    let mut result = 0usize;
    for i in a..=b {
        for j in c..=d {
            result = result.max((i+j)%m);
        }
    }
    println!("{}", result);
}