#include <bits/stdc++.h>
using namespace std;
using ll = long long;

template<class T> istream& operator >> (istream& is, vector<T>& vec) {
    for(T& x : vec) is >> x;
    return is;
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n, k;
    cin >> n >> k;
    vector<ll> a(n);
    vector<map<ll,int>> dp(n + 1);
    cin >> a;
    dp[0][0] = k;
    for(int i = 0; i < n; i++){
        for(auto &&[key, cnt] : dp[i]){
            for(int j = 0; j <= cnt; j++){
                int v = gcd(key, a[i] + j);
                dp[i + 1][v] = max(dp[i + 1][v], cnt - j);
                v = gcd(key, max(0ll, a[i] - j));
                dp[i + 1][v] = max(dp[i + 1][v], cnt - j);
            }
        }
    }
    cout << (*dp[n].rbegin()).first << '\n';
}