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

public class Yuki1 {
	
	public static void main(String[] argas) {
	
		Scanner scan = new Scanner(System.in);
		// 箱の幅
		int box = scan.nextInt();
		// ブロックの数
		int blockCount = scan.nextInt();
	
		int[] blockWidth = new int [blockCount];
				
		for (int i = 0; i < blockWidth.length; i++) {
			blockWidth[i] = scan.nextInt();
		}
		
		Arrays.sort(blockWidth);
		
		int boxWidthAll = 0;
		int boxWidthAllCount = 0;
		
		while(box>boxWidthAll && blockCount>boxWidthAllCount){
			
			boxWidthAll +=blockWidth[boxWidthAllCount];

			if(box>boxWidthAll) {
				boxWidthAllCount++;
			}
		}
		
		System.out.println(boxWidthAllCount);
	}	
}