/*No.5 数字のブロック*/
import java.util.*;
public class No5 {
	public static void main(String[] args) {
		short box_width,block_quantity,count;		
		try(Scanner input = new Scanner(System.in)){
			box_width=input.nextShort();
			block_quantity=input.nextShort();
			short block_width[]= new short[block_quantity];
			for(int i=0;i<block_quantity;i++){
				block_width[i]=input.nextShort();
			}
			Arrays.sort(block_width);
			for(count=1;count<=block_quantity;count++){
				box_width-=block_width[count-1];
				if(box_width<0){
					break;
				}
			}
			System.out.println(count-1);
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}