#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

#include <atcoder/all>
using namespace atcoder;

#define REP(i, n) for(int i = 0; i < (int)n; i++)
#define LREP(i, n) for(LL i = 0; i < (LL)n; i++)
#define RREP(i, n) for(int i = (int)n-1; i >= 0; i--)
#define V(T) vector<T>

#define P pair<int, int>
#define LP pair<LL, LL>
#define T3 tuple<LL, LL, LL>
#define T4 tuple<LL, LL, LL, LL>
#define INF 1000000007
#define SIZE 500100
#define MOD 998244353
typedef long long LL;

int N, K;
int A[SIZE];

int main() {
	cin >> N >> K;
	REP(i, N) cin >> A[i];
	sort(A, A + N, greater<int>());

	int ans = 0;
	REP(mask, 1 << (N - 1)) {
		int X = K;
		REP(i, N - 1) {
			if (mask & (1 << i)) {
				X = X % A[i];
			}
		}
		X = X % A[N - 1];
		ans = max(ans, X);
	}
	cout << ans << endl;
}