Sushi.java

import java.util.*;

public class Sushi
{
    public static void main(String[] args) 
    {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int M = sc.nextInt();
        long[] shari = new long[N];
        long[] neta = new long[M];
        for (int i = 0; i < N; i++) 
        {
            shari[i] = sc.nextLong();
        }
        for (int i = 0; i < M; i++) 
        {
            neta[i] = sc.nextLong();
        }
        Arrays.sort(shari);
        Arrays.sort(neta);
        int i = 0;
        int j = 0;
        int count = 0;
        while (i < N && j < M) 
        {
            if (neta[j] <= 2 * shari[i]) 
            {
                count++;
                i++;
                j++;
            } 
            else 
            {
                i++;
            }
        }
        System.out.println(count);
    }
}