#include <bits/stdc++.h>
using namespace std;
bool isPowerOfTwo(int x) { return x && (!(x & (x - 1))); }
int takemod(int x) { return (x % 1000000007 + 1000000007) % 1000000007; }
int fpow(int base, int power, int MOD) {
  int result = 1;
  base = base % MOD;
  while (power) {
    if (power & 1) result = (result * base) % MOD;
    base = (base * base) % MOD;
    power = power >> 1;
  }
  return result;
}
int modinv(int x) { return fpow(x, 1000000007 - 2, 1000000007); }
long long int lo(long long int a, long long int b) {
  return (int(log(a) / log(b)));
}
long long int er(long long int n, long long int pr) {
  long long int cnt = 0;
  while (n % pr == 0) {
    cnt++;
    n /= pr;
    if (n == 1) break;
  }
  return cnt;
}
void solve() {
  long long int n, q;
  cin >> n >> q;
  vector<long long int> A(n);
  map<long long int, long long int> pq;
  for (long long int i = 0; i < (n); ++i) {
    cin >> A[i];
    pq[A[i]]++;
  }
  while (q--) {
    long long int x, ans = 0;
    cin >> x;
    if (pq[1] == 0 && x & 1) {
      cout << "-1"
           << "\n";
      continue;
    }
    for (auto it = pq.rbegin(); it != pq.rend(); ++it) {
      if (lo(it->first, 2) > lo(x, 2)) {
        continue;
      } else {
        long long int t = x / (it->first);
        if (t > it->second) {
          x -= (it->first) * (it->second);
          ans += (it->second);
        } else {
          x -= (t) * (it->first);
          ans += (t);
        }
      }
    }
    if (x == 0) {
      cout << ans << "\n";
    } else {
      cout << "-1"
           << "\n";
    }
  }
}
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  int T = 1;
  while (T--) {
    solve();
  }
  return 0;
}
