#include <algorithm>
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(), (x).end()
#define ll long long
#define ld long double
#define INF 1000000000000000000
typedef pair<ll, ll> pll;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll N, K;
    cin >> N >> K;
    vector<ll> A(N);
    rep(i, N) { cin >> A[i]; }
    sort(all(A), greater<ll>());

    ll ans = 0;
    for (int bit = 0; bit < (1 << N - 1); bit++) {
        ll tmp = K;
        vector<int> S;
        rep(i, N - 1) {
            if (bit & (1 << i))
                S.push_back(A[i]);
        }

        rep(i, S.size()) { tmp %= S[i]; }

        tmp %= A[N - 1];
        ans = max(ans, tmp);
    }

    cout << ans << endl;

    return 0;
}