#include <bits/stdc++.h>
using namespace std;
int main()
{
    int sum,cnt=0;
    int n;
    cin>>sum>>n;
    for(int i=0;i<n;i++)
    {
        int t;
        cin>>t;
        if(sum-t>=0)sum-=t;
        else cnt++;
    }
    cout<<cnt;
    return 0;
}

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