#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;

using isize = size_t;
using i32 = int;
using u32 = unsigned int;
using i64 = long long;
using u64 = unsigned long long;
using i128 = __int128_t;
using u128 = __uint128_t;
using f64 = long double;
using p2 = pair<i64, i64>;
using el = tuple<i64, i64, i64>;
using mint = atcoder::modint998244353;

void _main();
int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(18);
  _main();
}

i64 pow(i64 x, i64 n) {
  i64 res = 1;
  i64 t = x;
  while (n > 0) {
    if (n & 1) res *= t;
    t *= t;
    n >>= 1;
  }
  return res;
}
i64 pow(i64 x, i64 n, i64 m) {
  i64 res = 1;
  i64 t = x % m;
  while (n > 0) {
    if (n & 1) res = res * t % m;
    t = t * t % m;
    n >>= 1;
  }
  return res;
}

void _main() {
  i64 ttt;
  cin >> ttt;
  for (;ttt--;) {
    i64 n;
    cin >> n;
    if (__builtin_popcountll(n) == 1) {
      cout << "-1\n";
      continue;
    }
    i64 ans = -1;
    i64 cnt = 0;
    for (i64 i = 0; true; i++) {
      if (n >> i & 1) {
        cnt++;
      } else if (cnt >= 2) {
        i64 x = n;
        x = x >> (i + 1) << (i + 1);
        x += 1 << i;
        ans = x - n;
        break;
      }
    }
    cout << ans << "\n";
  }
}