#include <bits/stdc++.h>
using namespace std;
 
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
 
    int n;
    cin >> n;
    vector<int> arr(n);
    for(int i = 0; i < n; i++){
        cin >> arr[i];
    }
 
    vector<int> count_one(32, 0);
    for(int j = 0; j < n; j++){
        for(int bit = 0; bit < 32; bit++){
            if((arr[j] >> bit) & 1){
                count_one[bit]++;
            }
        }
    }
 
    unsigned int y = 0;
    for(int i = 0; i < 32; i++){
        int c_one = count_one[i];
        int c_zero = n - c_one;
        if(c_zero > c_one && count_one[i]!=0){
            y |= (1U << i);
        }
    }
 
    cout << y << endl;
 
    return 0;
}

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