#include <bits/stdc++.h>
#include <iomanip>
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
#define fi first
#define se second
typedef long long ll;
typedef vector<ll> vec;
typedef vector<vec> mat;

ll N,M,H,W,Q,K,A,B;
string S;
const ll MOD = 998244353;
//const ll MOD = (1e+9) + 7;
typedef pair<ll, ll> P;
const ll INF = (1LL<<58);

template<class T> bool chmin(T &a, const T &b){
    if(a > b) {a = b; return true;}
    else return false;
}
template<class T> bool chmax(T &a, const T &b){
    if(a < b) {a = b; return true;}
    else return false;
}

void dfs(vec &a, ll &ans, ll temp, int id){
    if(id == N) {
        chmax(ans, temp%a[N - 1]);
    }else{
        dfs(a, ans, temp % a[id], id + 1);
        dfs(a, ans, temp, id + 1);
    }
}

int main() {
    cin>>N>>K;
    vec a(N);
    rep(i,N) cin>>a[i];
    sort(ALL(a));
    a.erase(unique(ALL(a)), a.end());
    reverse(ALL(a));
    N = a.size();
    ll ans = 0;
    dfs(a, ans, K, 0);
    cout<<ans<<endl;
}