#include<bits/stdc++.h>
using namespace std;
bool cmp(int a,int b)
{
    if(a>b) return true;
    else return false;
}
int main()
{
    int m,n;
    cin>>m>>n;
    int a[105];
    int cc = 0;
    for(int i = 1;i<=n;i++)
    {
        cin>>a[i];
    }
    sort(a+1,a+n+1,cmp);
    for(int i = 1;i<=n;i++)
    {
        if(m <= 0)
        {
            cout<<cc;
        }
        else if(m != 0)
        {
            m=m-a[i];
            cc++;
        }
        else
        {
            cout<<"NO";
        }
    }
    // for(int i = 1;i<=n;i++)
    // {
    //     cout<<a[i];
    // }
}
/**************************************************************
	Problem: 1326
	User: wuyichen
	Language: C++
	Result: Wrong Answer
****************************************************************/