import java.io.*;
import java.math.*;
import java.text.*;
import java.util.*;
import java.util.regex.*;

public class Solution 
{
    static class InputReader
	{
	    private final InputStream stream;
	    private final byte[] buf = new byte[8192];
	    private int curChar, snumChars;
 
	    public InputReader(InputStream st) {
	      this.stream = st;
	    }
 
	    public int read() {
	      if (snumChars == -1)
	        throw new InputMismatchException();
	      if (curChar >= snumChars) {
	        curChar = 0;
	        try {
	          snumChars = stream.read(buf);
	        } catch (IOException e) {
	          throw new InputMismatchException();
	        }
	        if (snumChars <= 0)
	          return -1;
	      }
	      return buf[curChar++];
	    }
 
	    public int nextInt() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      int res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }
 
	    public long nextLong() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      int sgn = 1;
	      if (c == '-') {
	        sgn = -1;
	        c = read();
	      }
	      long res = 0;
	      do {
	        res *= 10;
	        res += c - '0';
	        c = read();
	      } while (!isSpaceChar(c));
	      return res * sgn;
	    }
 
	    public int[] nextIntArray(int n) {
	      int a[] = new int[n];
	      for (int i = 0; i < n; i++) {
	        a[i] = nextInt();
	      }
	      return a;
	    }
 
	    public String readString() {
	      int c = read();
	      while (isSpaceChar(c)) {
	        c = read();
	      }
	      StringBuilder res = new StringBuilder();
	      do {
	        res.appendCodePoint(c);
	        c = read();
	      } while (!isSpaceChar(c));
	      return res.toString();
	    }
 
	    public String nextLine() {
	      int c = read();
	      while (isSpaceChar(c))
	        c = read();
	      StringBuilder res = new StringBuilder();
	      do {
	        res.appendCodePoint(c);
	        c = read();
	      } while (!isEndOfLine(c));
	      return res.toString();
	    }
 
	    public boolean isSpaceChar(int c) {
	      return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
	    }
 
	    private boolean isEndOfLine(int c) {
	      return c == '\n' || c == '\r' || c == -1;
	    }
	}
    public static void main(String[] args) throws IOException 
    {
        InputReader in=new InputReader(System.in);
        int n=in.nextInt();
        int q=in.nextInt();
        long[] ar=new long[n];
        String[] rd=in.nextLine().trim().split("\\s+");
        HashMap<Long,Integer> map=new HashMap<Long,Integer>();
        for(int i=0;i<n;i++)
        {
            ar[i]=Long.parseLong(rd[i]);
            if(map.get(ar[i])==null)
            {
                map.put(ar[i],1);
            }
            else
            {
                map.replace(ar[i],map.get(ar[i])+1);
            }
        }
        long[] power=new long[33];
        power[0]=1;
        for(int i=1;i<=32;i++)
        {
            power[i]=power[i-1]*2L;
        }
        for(int j=0;j<q;j++)
        {
            long b=in.nextLong();
            long num=b;
            boolean np=false;
            long coins=0;
            while(num>0)
            {
                boolean found=false;
                for(int i=32;i>=0;i--)
                {
                    if(power[i]<=num && map.get(power[i])!=null)
                    {
                        //num-=power[i];
                        long x=num/power[i];
                        found=true;
                        if(x<=1)
                        {
                            num-=power[i];
                            coins++;
                        }
                        else
                        {
                            if(x<=(long)map.get(power[i]))
                            {
                                num-=(x*power[i]);
                                coins+=x;
                            }
                            else
                            {
                                num-=((long)map.get(power[i])*power[i]);
                                coins+=(long)map.get(power[i]);
                            }
                        }
                    }
                }
                if(!found)
                {
                    np=true;
                    break;
                }
            }
            if(np)
            {
                System.out.println("-1");
            }
            else
            {
                System.out.println(coins);
            }
        }
    }
}
