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

public class Main {
    static int[] dp;
    static HashSet<Integer> ones = new HashSet<>();
    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());
        }
        dp = new int[1 << n];
        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) {
                ones.add(i);
                dp[i] = 1;
            }
        }
        System.out.println(dfw((1 << n) - 1));
    }
    
    static int dfw(int key) {
        if (key == 0) {
            return 0;
        }
        if (dp[key] != 0) {
            return dp[key];
        }
        int min = Integer.MAX_VALUE;
        for (int x : ones) {
            if ((x & key) != x) {
                continue;
            }
            min = Math.min(min, dfw(x ^ key) + 1);
            if (min == 2) {
                break;
            }
        }
        dp[key] = min;
        return min;
    }
}