#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;
			}	
        }
    }
    
}


/**************************************************************
	Problem: 1326
	User: chenruhong
	Language: C++
	Result: Accepted
	Time:19 ms
	Memory:2076 kb
****************************************************************/