#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <algorithm>
#include <cstdlib>
#include <ctime>
#include <cstdio>
#include <functional>
#include <set>
#include <sstream>
#include <map>
#include <queue>
#include <stack>

using namespace std;


int main()
{
	int n;
	cin>>n;
	unsigned long long _or=0;
	for(int i=0;i<n;i++){
		unsigned long long a;
		cin>>a;
		_or|=a;
	}

	unsigned long long res=1;
	while(_or){
		if(_or%2) res*=2LL;
		_or/=2;
	}

	cout<<res<<endl;

	return 0;
}