fn main() {
    let v = read_vec::<i64>();
    let (n, k) = (v[0] as usize, v[1]);
    let mut a = read_vec::<i64>();
    a.sort();
    a.reverse();

    let mut ans = 0;
    for state in 0..1 << (n - 1) {
        let mut temp = k;
        for j in 0..n - 1 {
            if (state >> j) & 1 == 1 {
                temp %= a[j];
            }
        }
        temp %= a[n - 1];
        ans = std::cmp::max(ans, temp);
    }
    println!("{}", ans);
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}