using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static int[][] NArr(long n) => Enumerable.Repeat(0, (int)n).Select(_ => NList).ToArray();
    static int[] NMi => ReadLine().Split().Select(c => int.Parse(c) - 1).ToArray();
    static int[][] NMap(int n) => Enumerable.Repeat(0, n).Select(_ => NMi).ToArray();

    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var t = NN;
        var ans = new int[t];
        for (var u = 0; u < t; ++u)
        {
            var n = NN;
            ans[u] = Smaller(n);
        }
        WriteLine(string.Join("\n", ans));
    }
    static int Smaller(int n)
    {
        var count = 0;
        for (var i = 0; i <= 30; ++i)
        {
            if (((n >> i) & 1) == 0)
            {
                if (count >= 2)
                {
                    var ans = 1 << i;
                    for (var j = i + 1; j <= 30; ++j) if (((n >> i) & 1) != 0) ans |= 1 << j;
                    return ans - n;
                }
            }
            else ++count;
        }
        return -1;
    }
}