import java.io.*;
import java.util.*;
public class D
{
    private static int min(int a, int b)
    {
        return (a<b)?a:b;
    }
    public static void main(String[] args) throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));

        int i,N,Q,ans,val,len=0,tmp;

        String s[]=br.readLine().trim().split(" ");

        N=Integer.parseInt(s[0]);
        Q=Integer.parseInt(s[1]);

        StringBuilder sb=new StringBuilder();

        s=br.readLine().trim().split(" ");

        int a[]=new int[N];

        for(i=0;i<N;i++)
          a[i]=Integer.parseInt(s[i]);

        Arrays.sort(a);

        int b[][]=new int[30][2];
        b[len][0]=a[0];
        b[len++][1]=1;

        for(i=1;i<N;i++)
        {
            if(a[i]==a[i-1])
                b[len-1][1]++;
            else
            {
                b[len][0]=a[i];
                b[len++][1]=1;
            }
        }

        while(Q-->0)
        {
            ans=0;
            val=Integer.parseInt(br.readLine().trim());

            for(i=len-1;i>=0&&val>0;i--)
            {
                if(b[i][0]<=val)
                {
                    tmp=val/b[i][0];

                    val-=b[i][0]*min(tmp,b[i][1]);
                    ans+=min(tmp,b[i][1]);
                }
            }

            if(val==0)
                sb.append(ans);
            else
                sb.append(-1);

            sb.append("\n");
        }
        System.out.println(sb);
    }
}