import java.util.Arrays;
import java.util.Scanner;

public class Main {
	
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		
		final int L = sc.nextInt();
		final int N = sc.nextInt();
		
		int[] ws = new int[N];
		for(int i = 0; i < N; i++){
			ws[i] = sc.nextInt();
		}
		
		int[] DP = new int[L + 1];
		Arrays.fill(DP, -1);
		DP[0] = 0;
		
		int max = Integer.MIN_VALUE;
		for(final int weight : ws){
			for(int current = L - weight; current >= 0; current--){
				if(DP[current] < 0){
					continue;
				}
				
				DP[weight + current] = Math.max(DP[weight + current], DP[current] + 1);
				max = Math.max(max, DP[weight + current]);
			}
		}
		
		System.out.println(max);
	}
	
}