#include<bits/stdc++.h>
#define REP(i,n) for(int i=0,i##_len=int(n);i<i##_len;++i)
#define rep(i,a,b) for(int i=int(a);i<int(b);++i)
#define All(x) (x).begin(),(x).end()
#define rAll(x) (x).rbegin(),(x).rend()
using namespace std;
using ll = long long;

int main(){
    int N,K;
    cin>>N>>K;
    vector<vector<int>> v(N+1);
    vector<int> A(N);
    REP(i,N) cin>>A[i];
    v[N].push_back(K);
    sort(All(A));
    for(int i=N-1;i>=0;--i) rep(j,i,N) for(auto p:v[j+1]){
        int k = upper_bound(All(A),p%A[i]) - A.begin();
        v[k].push_back(p%A[i]);
    }
    cout<<*max_element(All(v[0]))<<endl;
}