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

public class Main {
    static int[][] dp;
    static int t;
    static int n;
    static int[] times;
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        t = Integer.parseInt(br.readLine());
        n = Integer.parseInt(br.readLine());
        times = new int[n];
        for (int i = 0; i < n; i++) {
            times[i] = Integer.parseInt(br.readLine());
        }
        dp = new int[1 << n][t + 1];
        int min = dfw((1 << n) - 1, 0);
        System.out.println(min);
    }
    
    static int dfw(int key, int value) {
        if (key == 0) {
            return 0;
        }
        if (dp[key][value] != 0) {
            return dp[key][value];
        }
        int min = Integer.MAX_VALUE / 10;
        for (int i = 0; i < n; i++) {
            if ((key & (1 << i)) == 0) {
                continue;
            }
            if (value < times[i]) {
                min = Math.min(min, dfw(key ^ (1 << i), t - times[i]) + 1);
            } else {
                min = Math.min(min, dfw(key ^ (1 << i), value - times[i]));
            }
        }
        dp[key][value] = min;
        return min;
    }
}