import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int t = Integer.parseInt(br.readLine());
        int n = Integer.parseInt(br.readLine());
        int[] times = new int[n];
        for (int i = 0; i < n; i++) {
            times[i] = Integer.parseInt(br.readLine());
        }
        HashSet<Integer>[] dp= new HashSet[n];
        dp[0] = new HashSet<>();
        for (int i = 1; i < (1 << n); i++) {
            int sum = 0;
            for (int j = 0; j < n; j++) {
                if ((i & (1 << j)) == 0) {
                    continue;
                }
                sum += times[j];
                if (sum > t) {
                    break;
                }
            }
            if (sum <= t) {
                dp[0].add(i);
            }
        }
        for (int i = 1; i <= n; i++) {
            if (dp[i - 1].contains((1 << n) - 1)) {
                System.out.println(i);
                return;
            }
            dp[i] = new HashSet<>();
            for (int x : dp[i - 1]) {
                for (int y : dp[0]) {
                    if ((x & y) != 0) {
                        continue;
                    }
                    if (!dp[i - 1].contains(x | y)) {
                        dp[i].add(x | y);
                    }
                }
            }
        }
    }
}