#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;
    int k = 0;
    for(int i = 1;i<=n;i++)
    {
        cin>>a[i];
        k+=a[i];
    }
    //cout << k<<endl;
    sort(a+1,a+n+1,cmp);
    if(k < m)
    {
        cout<<"NO";
    }
    else
    {
        for(int i = 1;i<=n;i++)
        {
            if(m <= 0)
            {
              cout<<cc;
              break;
            }
            else
            {
                m=m-a[i];
                cc++;
            }
    }
    }
    // for(int i = 1;i<=n;i++)
    // {
    //     cout<<a[i];
    // }
}
/**************************************************************
	Problem: 1326
	User: wuyichen
	Language: C++
	Result: Accepted
	Time:15 ms
	Memory:2076 kb
****************************************************************/