#include <bits/stdc++.h>
using namespace std;
const long long INF = (2 * 1e9);
long long get(long long a) {
  for (long long i = 0; i < 31; ++i) {
    if ((a >> i) & 1) {
      return i;
    }
  }
}
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long n, q;
  cin >> n >> q;
  multiset<long long> v;
  for (long long i = 0; i < n; ++i) {
    long long a;
    cin >> a;
    v.insert(a);
  }
  vector<long long> dp(32);
  vector<long long> pow(32);
  pow[0] = 1;
  for (long long i = 1; i < 32; ++i) {
    pow[i] = pow[i - 1] * 2;
  }
  for (auto i : v) {
    dp[get(i)]++;
  }
  for (long long i = 0; i < q; ++i) {
    long long ans = 0;
    long long a;
    cin >> a;
    if (a <= 0) {
      cout << -1 << '\n';
      continue;
    }
    bool st = true;
    auto copy = dp;
    for (long long j = 31; j >= 0; --j) {
      if ((a >> j) & 1) {
        long long local = 0;
        long long need = pow[j];
        for (long long k = j; k >= 0 && need - local > 0; --k) {
          if (copy[k] > 0) {
            if (copy[k] * pow[k] <= need - local) {
              ans += copy[k];
              local += copy[k] * pow[k];
              copy[k] = 0;
            } else {
              long long x = need - local;
              long long ZZ = x / pow[k];
              ans += min(ZZ, copy[k]);
              local += min(ZZ, copy[k]) * pow[k];
              copy[k] -= min(ZZ, copy[k]);
            }
          }
        }
        if (need != local) {
          cout << -1 << '\n';
          st = false;
          break;
        }
      }
    }
    if (st) cout << ans << '\n';
  }
}
