#include<bits/stdc++.h>
using namespace std;
int m,n,a[100],s=0,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: wangsenlin
	Language: C++
	Result: Accepted
	Time:14 ms
	Memory:2076 kb
****************************************************************/