import java.io.BufferedReader;
import java.io.IOError;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer stk = new StringTokenizer(br.readLine());
        int n = Integer.parseInt(stk.nextToken());
        int q = Integer.parseInt(stk.nextToken());
        int[] arr = new int[n];
        stk = new StringTokenizer(br.readLine());
        int[] twos = new int[33];
        for(int i=0;i<n;i++){
            arr[i] = Integer.parseInt(stk.nextToken());
            int cnt = 0 ;
            while(arr[i]>1){
                arr[i]/=2;
                cnt++;
            }
            twos[cnt] +=1;
        }
        StringBuilder sb= new StringBuilder();
        for(int i=0;i<q;i++){
            int b = Integer.parseInt(br.readLine());
            int bb = b;
            Stack<Integer> stack = new Stack<>();
            int[] tempTwos = new int[33];
            for(int j=0;j<33;j++){
                tempTwos[j] = twos[j];
            }
            while(b>=1){
                stack.add(b%2);
                b/=2;
            }
            boolean[] check = new boolean[33];
            int cnt = stack.size()-1;
            while(!stack.isEmpty()){
                if(stack.pop()==1){
                    check[cnt] = true;
                }
                cnt--;
            }
            int need = 0 ;
            int ans = 0;
            boolean flag = false;

            for(int j=0;j<33;j++){
              //  System.out.println(bb+" "+j);
                if(check[j]){
               //     System.out.println("췤");
                    if(checkFunc(1,j,tempTwos)){
                    }
                    else{
            //            System.out.println("여기서 실패"+j);
                        flag = true;
                        break;
                    }
                }
            }
            if(!flag) {
                for(int k=0;k<33;k++){
                    need+= Math.abs(tempTwos[k]-twos[k]);
                }
                sb.append(need).append('\n');
            }
            else sb.append(-1).append('\n');
        }
        System.out.print(sb);
    }
    public static boolean checkFunc(int need,int index,int[] twos){
        if(index<0) return false;
        if(twos[index]>=need){
             twos[index] -= need;
            return true;
        }
        else{
            int differ = need - twos[index];
            twos[index] = 0;
            return checkFunc(differ*2,index-1,twos);
        }
    }
}