fn main() {
    let (n, k): (usize, usize) = {
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let mut iter = buf.split_whitespace();
        (
            iter.next().unwrap().parse().unwrap(),
            iter.next().unwrap().parse().unwrap(),
        )
    };

    let mut a: Vec<usize> = {
        let mut buf = String::new();
        std::io::stdin().read_line(&mut buf).unwrap();
        let iter = buf.split_whitespace();
        iter.map(|x| x.parse().unwrap()).collect()
    };

    a.sort_by(|a, b| b.cmp(a));

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