#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <cmath>
#include <numeric>
#include <utility>
#include <iomanip>

using namespace std;
using int64 = long long;

struct aaa{aaa(){cin.tie(nullptr); ios::sync_with_stdio(false); cout<<fixed<<setprecision(20);};}aaa;

int main() {
    int n, k;
    cin >> n >> k;
    vector<int> a(n);
    int mini = 1000000001;
    for (int i=0; i<n; i++) {
        cin >> a[i];
        mini = min(mini, a[i]);
    }
    // sort(a.begin(), a.end());
    int ans = 0;
    for (auto i : a) {
        if (k%i >= mini) continue;
        ans = max(ans, k%i);
    }

    cout << ans << endl;
}