import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        boolean[][] nums = new boolean[n][31];
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            for (int j = 0; j < 31; j++) {
                nums[i][j] = (x % 2 == 1);
                x /= 2;
            }
        }
        long ans = 0;
        for (int i = 0; i < 31; i++) {
            int count = 0;
            for (int j = 0; j < n; j++) {
                if (nums[j][i]) {
                    count++;
                }
            }
            if (count >= n - count) {
                ans += (1L << i) * (n - count);
            } else {
                ans += (1L << i) * count;
            }
        }
        System.out.println(ans);
    }
}