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

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int time = sc.nextInt();
        int n = sc.nextInt();
        int[] values = new int[n];
        for (int i = 0; i < n; i++) {
            values[i] = sc.nextInt();
        }
        int[] totals = new int[1 << n];
        int[] counts = new int[1 << n];
        for (int i = 0; i < (1 << n); i++) {
            for (int j = 0; j < n; j++) {
                if ((i & (1 << j)) == 0) {
                    continue;
                }
                totals[i] = totals[i ^ (1 << j)] + values[j];
                break;
            }
            if (totals[i] <= time) {
                counts[i] = 1;
                continue;
            }
            counts[i] = Integer.MAX_VALUE / 2;
            for (int j = i; j > 0; j = ((j - 1) & i)) {
                counts[i] = Math.min(counts[i], counts[j] + counts[j ^ i]);
            }
        }
        System.out.println(counts[(1 << n) - 1]);
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        if (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
}