import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());

        // Read k and n
        int k = Integer.parseInt(st.nextToken());
        int n = Integer.parseInt(st.nextToken());

        // Read the array a
        int[] a = new int[n];
        st = new StringTokenizer(br.readLine());
        for (int i = 0; i < n; i++) {
            a[i] = Integer.parseInt(st.nextToken());
        }

        // Sort the array
        Arrays.sort(a);

        // Iterate through the sorted array
        for (int i = 0; i < n; i++) {
            k -= a[i];
            if (k < 0) {
                System.out.println(i);
                return;
            }
        }

        // If all elements are used
        System.out.println(n);
    }
}