#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
using ll = long long;
template <class T>
using V = vector<T>;
const ll inf = (1e18);
const ll mod = 1000000007;
ll gcd(ll a, ll b) { return b ? gcd(b, a % b) : a; }
ll lcm(ll c, ll d) { return c / gcd(c, d) * d; }
struct __INIT {
  __INIT() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(15);
  }
} __init;
template <class T>
bool chmax(T &a, const T &b) {
  if (a < b) {
    a = b;
    return 1;
  }
  return 0;
}
template <class T>
bool chmin(T &a, const T &b) {
  if (a > b) {
    a = b;
    return 1;
  }
  return 0;
}
int main() {
  int n, q;
  cin >> n >> q;
  vector<int> pow(61, 0), cp(61);
  for (int i = 0; i < n; i++) {
    int cnt = 0;
    ll a;
    cin >> a;
    for (int j = 0; j < 60; j++) {
      if (a & (1ll << j)) {
        pow[j]++;
        break;
      }
    }
  }
  while (q--) {
    int cnt = 0, t;
    cin >> t;
    for (int i = 0; i < 60; i++) cp[i] = pow[i];
    bool ok = true;
    for (int i = 60; i >= 0; i--) {
      if (t & (1ll << i)) {
        if (cp[i])
          cnt++;
        else {
          ll need = 1;
          for (int j = i; j >= 0; j--) {
            if (need <= cp[j]) {
              cnt += need;
              cp[j] -= need;
              break;
            } else {
              cnt += cp[j];
              need -= cp[j];
              cp[j] = 0;
              need *= 2;
              if (j == 0) ok = false;
            }
          }
        }
      }
      if (!ok) break;
    }
    if (!ok)
      cout << -1 << endl;
    else
      cout << cnt << endl;
  }
}
