#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define all(x) x.begin(),x.end()
#define rep(i,a,b) for(int i=a;i<=b;i++)
#define rep_r(i,a,b) for(int i=a;i>=b;i--)
#define each(a,x) for (auto& x : a)
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using vi = vector<int>;
using vl = vector<ll>;
#define sz(x) int(x.size())
#define so(x) sort(all(x))
#define so_r(x) sort(all(x),greater<int>())
#define lb lower_bound
#define ub upper_bound
const char nl = '\n';
int dx[4] = {1,-1,0,0};
int dy[4] = {0,0,1,-1};
int bit_cnt(int x){
    return __builtin_popcount(x);
}
ll bex(ll a, ll b, ll mod = 1e9 + 7){ll res = 1LL; while(b){ if (b&1) res = res * a % mod; a = a * a % mod; b >>= 1;} return res;}
template<class t,class u> bool chmax(t&a,u b){if(a<b){a=b;return true;}else return false;}
template<class t,class u> bool chmin(t&a,u b){if(b<a){a=b;return true;}else return false;}

const int MOD = 998244353;
const int N = 5e5 + 5;
const ll INF = 1e16;
int a[25];
int n;
ll K;
void solve(){
    cin >> n; 
    cin >> K; 
    rep(i,0,n-1) cin >> a[i];
    // https://yukicoder.me/problems/no/1083
    // Brief: cho day A gom N so nguyen va K 
    // Tuy y sap xep thu tu trong A
    // X = K % A[1] % A[2] .... % A[N]
    // Tim Max X

    // constraint: N <= 20, K <= 1e9, A <= 1e9

    // K % A[i] % A[j] = K % A[i] (if A[i] < A[j])

    sort(a,a+n, greater<>());
    ll ans = 0; 
    rep(msk,0,(1<<(n-1))-1){
        ll cur = K;
        rep(i,0,n-2) if (msk>>i&1) cur %= a[i];
        chmax(ans,cur%a[n-1]);
    }
    cout << ans << nl;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

    int t = 1; 
    // cin >> t;

    while (t--){
        solve();
    }
}