#include <bits/stdc++.h>
using namespace std;
int const N = 2e5 + 1;
int n, q, a[N], fr[35], fr1[35];
bool check() {
  for (int i = 0; i < 35; ++i)
    if (fr1[i] != 0) return false;
  return true;
}
int main() {
  scanf("%d %d", &n, &q);
  for (int i = 0; i < n; ++i) {
    scanf("%d", a + i);
    bitset<32> bs(a[i]);
    for (int i = 0; i < 32; ++i)
      if (bs[i] == 1) ++fr[i];
  }
  while (q-- != 0) {
    int tmp;
    scanf("%d", &tmp);
    bitset<32> bs(tmp);
    memset(fr1, 0, sizeof fr1);
    for (int i = 0; i < 32; ++i) fr1[i] = bs[i];
    int cnt = 0;
    for (int i = 31; i >= 0; --i) {
      if (i > 0 && fr1[i] != 0 && fr[i] == 0) {
        fr1[i - 1] += fr1[i] * 2;
        fr1[i] = 0;
      } else if (i > 0 && fr1[i] != 0 && fr[i] < fr1[i]) {
        fr1[i - 1] += (fr1[i] - fr[i]) * 2;
        cnt += fr[i];
        fr1[i] = 0;
      } else if (fr1[i] != 0 && fr[i] >= fr1[i]) {
        cnt += fr1[i];
        fr1[i] = 0;
      }
    }
    if (check())
      printf("%d\n", cnt);
    else
      puts("-1");
  }
  return 0;
}
