import java.util.Arrays;
import java.util.Scanner;

public class Solution {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a, b;
        a = sc.nextInt();
        b = sc.nextInt();
        int[] c = new int[b];
        for (int i = 0; i < b; i++) {
            c[i] = sc.nextInt();
        }
        Arrays.sort(c);
        int sum = 0;
        int count = 0;
        for (int i = 0; i < b; i++) {
            if (sum + c[i] < a) {
                sum += c[i];
                count++;
            }
        }
        System.out.println(count);
    }
}