#include<bits/stdc++.h>
using namespace std;
int n,m,a[200],s,ans;
bool cmp(int x,int y){
	 return x>y;
} 
int main(){
	cin>>m>>n;
	for(int i=1;i<=n;i++){
		cin>>a[i];
		s=s+a[i];
	}
	if(s<m) cout<<"NO";
	else{
		sort(a+1,a+1+n,cmp);
		for(int i=1;i<=n;i++){
			ans=ans+a[i];
			if(ans>=m){
				cout<<i;
				break;
			}
		}
	}
    
 
    return 0;
}
/**************************************************************
	Problem: 1326
	User: laichenxu
	Language: C++
	Result: Accepted
	Time:23 ms
	Memory:2076 kb
****************************************************************/