#include using namespace std; #define rep(i,N) for(int i=0;i i_i; typedef pair l_l; template using vec = vector; template using vvec = vector>; template< typename T1, typename T2 > ostream &operator<<(ostream &os, const pair< T1, T2 >& p) { os << "{" < inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; } template inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; } const int INF = (ll)1e9; const ll INFLL = (ll)1e18+1; const ll MOD = (ll)1e9+7; const double PI = acos(-1.0); /* const int dx[8] = {1, 0, -1, 0, 1, -1, -1, 1}; const int dy[8] = {0, 1, 0, -1, 1, 1, -1, -1}; const string dir = "DRUL"; */ int main() { cin.tie(0); ios::sync_with_stdio(false); cout << fixed << setprecision(20); ll N, K; cin >> N >> K; vector A(N); rep(i, N)cin >> A[i]; sort(all(A)); vec B(N); rep(i,N){ B[i] = K % A[i]; } ll ans = 0; rep(i,N){ if(B[i] < A[0]){ chmax(ans, B[i]); } } cout << ans << endl; }