#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000


int main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N; cin >> N;
	int a[10000];
	rep(i, N) cin >> a[i];
	set<int> st;
	rep(i, N) {
		rep(j, 15) {
			if (a[i] & (1 << j)) {
				st.insert(j + 1);
			}
		}
	}
	int size = min(N, (int)st.size());
	cout << (int)(pow(2, size) + 0.5) << endl;



    return 0;
}