#include <bits/stdc++.h>
using namespace std;
long long n, q;
const long long nax = 2e5 + 4;
vector<long long> cnt;
long long a[nax];
void solve() {
  cin >> n >> q;
  cnt.resize(43);
  for (long long i = 1; i <= n; ++i) {
    cin >> a[i];
    cnt[__builtin_ctz(a[i])]++;
  }
  sort(a + 1, a + n + 1);
  for (long long i = 1; i <= q; ++i) {
    long long b;
    cin >> b;
    vector<long long> temp = cnt;
    bool ok = true;
    for (long long i = 0; i <= 40; ++i) {
      if ((1LL << i) & b) {
        if (temp[i] == 0) {
          ok = false;
          cout << -1 << '\n';
          break;
        } else {
          temp[i]--;
          temp[i + 1] += temp[i] / 2;
          temp[i] = 0;
        }
      } else {
        temp[i + 1] += temp[i] / 2;
        temp[i] = 0;
      }
    }
    if (ok) {
      long long cost = 0;
      vector<long long> test = cnt;
      for (long long i = 0; i <= 39; ++i) {
        if ((1LL << i) & b) {
          if (test[i] > 0) {
            ++cost;
            --test[i];
          } else {
            long long delta = 1;
            for (long long j = i - 1; j >= 0; --j) {
              delta <<= 1;
              if (test[j] > 0) {
                long long lol = min(delta, test[j]);
                test[j] -= lol;
                delta -= lol;
                cost += lol;
                if (delta > 0) continue;
              }
            }
          }
        }
      }
      cout << cost << '\n';
    }
  }
}
signed main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  long long t = 1;
  while (t--) {
    solve();
  }
}
