use std::cmp::Reverse;

use proconio::input;

fn main() {
    input! {
        (n, k): (usize, usize),
        mut aa: [usize; n],
    }

    aa.sort_unstable_by_key(|&a| Reverse(a));

    let calc_rem = |bit: usize| {
        (0..n - 1)
            .filter(|&i| bit >> i & 1 == 1)
            .fold(k, |acc, i| acc % aa[i])
            % aa[n - 1]
    };

    let ans = (0..1 << n - 1).map(calc_rem).max().unwrap();
    println!("{}", ans);
}