#include<bits/stdc++.h>
using namespace std;
int n,m,x; 
int minn=1e5;
bool f=0;
int main(){
	cin >> n >> m;
	for(int i=0; i<n; i++){
		cin >> x;
		if(m%x==0){
			if(m/x<minn){
				minn=m/x;
				f=1;
			}
		}
	}
	if(f==0) cout << "-1";
	else cout << minn;
	return 0;
}