import java.util.*;
class Test27{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt(); //16
		int W = sc.nextInt(); //3
		int[] num = new int[W]; //0,1,2
		int count = 0;
		
		for(int i=0; i<W; i++){ //i=0,1,2
			num[i] = sc.nextInt(); //num[0]=10 num[1]=5 num[2]=7
		}
		
	    Arrays.sort(num);
				
		for(int m=0; m<num.length; m++){
			N -= num[m];
			if(N>=0){
				count++;
			}
		}
		
		System.out.println(count);
	}
}