import java.util.Scanner;


public class no5 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int bigboxL=sc.nextInt();
		int N=sc.nextInt();
		int[] blockarray = new int[N];
		for(int i=0;i<N;i++){
			blockarray[i]=sc.nextInt();
		}
		for(int i=0;i<blockarray.length;i++){
			for(int j=i+1;j<blockarray.length;j++){
				if(blockarray[i]>=blockarray[j]){
					int swap=blockarray[i];
					blockarray[i]=blockarray[j];
					blockarray[j]=swap;
				}
			}
		}
		int cnt=0;
		for(int i=0;i<N;i++){
			bigboxL-=blockarray[i];
			if(bigboxL<0)break;
			cnt++;
		}
		System.out.println(cnt);
	}
}