use std::cmp::*;
use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: usize = itr.next().unwrap().parse().unwrap();
    let k: usize = itr.next().unwrap().parse().unwrap();
    let mut a: Vec<usize> = (0..n)
        .map(|_| itr.next().unwrap().parse().unwrap())
        .collect();

    a.sort_by(|a, b| b.cmp(a));
    let mut ans = 0;
    for bit in 1..1 << n {
        let mut b = Vec::new();
        for i in 0..n {
            if bit >> i & 1 == 1 {
                b.push(a[i]);
            }
        }
        let mut tmp = k;
        for i in 0..b.len() {
            tmp %= b[i];
        }
        ans = max(ans, tmp % a[n - 1]);
    }
    println!("{}", ans);
}