#include <bits/stdc++.h>
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using namespace std;
#define ll long long
#define INF 9999999999999999
#define rep(i, m, n) for (int i = m; i < n; i++)
#define rrep(i, m, n) for (int i = m - 1; i >= n; i--)
#define pb(n) push_back(n)
#define UE(N) N.erase(unique(N.begin(), N.end()), N.end());
#define Sort(n) sort(n.begin(), n.end())
#define Rev(n) reverse(n.begin(), n.end())
#define Out(S) cout << S << endl
#define NeOut(S) cout << S
#define HpOut(S) cout << setprecision(50) << S << endl
#define Vec(K, L, N, S) vector<L> K(N, S)
#define DV(K, L, N, M, S) vector<vector<L>> K(N, vector<L>(M, S))
#define TV(K, L, N, M, R, S) \
    vector<vector<vector<L>>> K(N, vector<vector<L>>(M, vector<L>(R, S)))
#define pint pair<ll, ll>
#define tint tuple<int, int, int>
#define paf(L, R) pair<L, R>
#define mod 1000000007
#define MAX 10000010
#define ALL(a) a.begin(), a.end()
#define chmax(a, b) a = (((a) < (b)) ? (b) : (a))
#define chmin(a, b) a = (((a) > (b)) ? (b) : (a))

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll N, K;
    cin >> N >> K;
    vector<ll> A(N);
    rep(i, 0, N) cin >> A[i];
    Sort(A);
    rrep(i, N, 0) K %= A[i];
    cout << K << endl;
}