fn main() {
    let mut nk = String::new();
    std::io::stdin().read_line(&mut nk).ok();
    let nk: Vec<usize> = nk.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();
    let n = nk[0];
    let k = nk[1];
    let mut a = String::new();
    std::io::stdin().read_line(&mut a).ok();
    let mut a: Vec<usize> = a.trim().split_whitespace().map(|s| s.parse().unwrap()).collect();

    a.sort();
    a.reverse();
    let minval = a.pop().unwrap();
    let n = a.len();
    let mut result = k % minval;
    for i in 1..1<<n {
        let val = (0..n).filter(|&j| ((i >> j) & 1) == 1).fold(k, |x, y| x % a[y]);
        result = result.max(val % minval);
    }
    println!("{}", result);
}