package yukicoder;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;

public class YukiCoderNo5 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		
		// Read Input
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		
		try{
			// Read 1st line
			int L = Integer.parseInt(br.readLine());
			
			// Read 2nd line
			int N = Integer.parseInt(br.readLine());
			
			// Read 3rd line to ArrayList
			String s[] = br.readLine().split(" ");
			ArrayList<Integer> list = new ArrayList<Integer>();
			for( int i=0; i<N; i++ ) {
				list.add(Integer.parseInt(s[i]));
			}
			Collections.sort(list);
			
			int sum = 0;
			int cnt = 0;
			for( int i=0; i<list.size(); i++ ) {
				sum+=list.get(i);
//				System.out.println("debug: " + sum);
				if(L <= sum){
					break;
				}
				cnt++;
			}
			
			// Output RESULT
			System.out.println(cnt);
			
		} catch(Exception e) {
			System.out.println("error!");
			return;			
		}
		
		return;
	}

}