\begin{array}{c} \color{#F5FAFF}{F} \color{#9EC1E9}{u} \color{#7DA6D9}{r} \color{#5C8BCD}{i} \color{#7A9CCF}{n} \color{#8BB0D9}{a} \color{#8BB0D9}{F} \color{#7A9CCF}{o} \color{#5C8BCD}{r} \color{#7DA6D9}{c} \color{#9EC1E9}{a} \color{#F5FAFF}{l} \color{#9EC1E9}{o} \color{#FFFFFF}{s} \end{array}

/** 
    * author: furina focalors 
    * from : A3K59 DHV
    * created: 20.09.2025
**/
#include<bits/stdc++.h>
#define hutao long long
using namespace std;
hutao a[1000005];
int main()
{
    ios::sync_with_stdio(0); 
    cin.tie(0); 
    cout.tie(0);
    hutao w,n;
    cin>>w>>n;
    for(hutao i=1;i<=n;i++)
    {
        cin>>a[i];
    }
    hutao sum=0;
    hutao tong=0;
    queue<hutao> q;
    for(hutao i=1;i<=n;i++)
    {
        q.push(a[i]);
        sum+=a[i];
        if(q.size()>4)
        { 
            sum-=q.front();
            q.pop();
        }
        if(sum>w)
        {
            break;
        }
        tong=i;
    }
    cout<<tong;
}