#include <bits/stdc++.h>
using namespace std;
const int N = 1000;
const double eps = 1e-9;
long long INF = 1e9;
const int OO = 0x3f3f3f3f;
int dx[] = {1, -1, 0, 0, 1, -1, 1, -1};
int dy[] = {0, 0, 1, -1, 1, -1, -1, 1};
void read(string str, int node) {
  stringstream ss;
  int number;
  ss << str;
  while (ss >> number) cout << number << endl;
}
long long fp(long long b, long long p) {
  if (p == 0) return 1;
  if (p % 2 == 0) return fp((b * b) % INF, p / 2);
  return (fp(b, p - 1) * b) % INF;
}
unsigned long long read_binary(string s) {
  unsigned long long x = 0, tmp = 1;
  for (int i = s.size() - 1; i >= 0; i--) {
    x = (x + tmp * (s[i] - '0')) % INF;
    tmp = (tmp * 2) % INF;
  }
  return x;
}
long long com(long long x, long long y) {
  long long sum = 1;
  for (int i = 1; i <= y; i++) {
    sum *= x;
    x--;
    sum /= i;
  }
  return sum;
}
long long gcd(long long n1, long long n2) {
  if (n2 != 0)
    return gcd(n2, n1 % n2);
  else
    return n1;
}
int setBit(int num, int idx, int val = 1) {
  return (val) ? (num | (1 << idx)) : (num & ~(1 << idx));
}
int getBit(int num, int idx) { return ((num >> idx) & 1) == 1; }
int cntBit(int num) {
  int ret = 0;
  while (num) {
    if (num % 2) ret++;
    num /= 2;
  }
  return ret;
}
bool sum[1500];
void sieve() {
  sum[0] = sum[1] = 1;
  for (int i = 2; i * i < 1002; i++) {
    if (!sum[i]) {
      for (int j = 2 * i; j < 1002; j += i) {
        sum[j] = 1;
      }
    }
  }
}
bool isp(long long x) { return (x & (x - 1)) == 0; }
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  ;
  long long n, q;
  cin >> n >> q;
  vector<long long> a(n);
  map<long long, long long> m;
  for (int i = 0; i < n; i++) cin >> a[i], m[a[i]]++;
  sort(a.begin(), a.end());
  for (int i = 0; i < q; i++) {
    long long x;
    cin >> x;
    long long res = 0;
    if (x % 2) {
      cout << -1 << endl;
      continue;
    }
    map<long long, long long>::reverse_iterator it;
    for (it = m.rbegin(); it != m.rend(); ++it) {
      long long f = it->first, s = it->second;
      if (x >= f) {
        if ((x / f) >= s) {
          x -= (f * s);
          res += s;
        } else {
          res += (x / f);
          x -= ((x / f) * f);
        }
      }
      if (!x) break;
    }
    if (!x)
      cout << res << endl;
    else
      cout << -1 << endl;
  }
}
