#include <bits/stdc++.h>
using namespace std;
const long long int Maxn3 = 1e3 + 10;
const long long int Maxn4 = 1e4 + 10;
const long long int Maxn5 = 1e5 + 10;
const long long int Maxn6 = 1e6 + 10;
const long long int Maxn7 = 1e7 + 10;
const long long int Maxn8 = 1e8 + 10;
const long long int Maxn9 = 1e9 + 10;
const long long int Maxn18 = 1e18 + 10;
const long long int Mod1 = 1e7 + 7;
const long long int Mod2 = 1e9 + 7;
const long long int LLMax = LLONG_MAX;
const long long int LLMin = LLONG_MIN;
const long long int INTMax = INT_MAX;
const long long int INTMin = INT_MIN;
long long int mn = LLMax, mx = LLMin;
map<long long int, long long int> m;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
  long long int n, q, x, s;
  cin >> n >> q;
  while (n--) {
    cin >> x;
    m[x]++;
  }
  while (q--) {
    cin >> x;
    s = 0;
    for (long long int t = 1 << 30; t > 0; t /= 2) {
      n = min(m[t], x / t);
      s += n;
      x -= n * t;
    }
    cout << (x > 0 ? -1 : s) << '\n';
  }
}
