#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
using namespace std;

#define ff              first
#define ss              second
#define int             long long
#define pb              push_back
#define mp              make_pair
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define zrobits(x)      __builtin_ctzll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         fixed<<setprecision(y)<<x
#define mk(arr,n,type)  type *arr=new type[n];
#define w(x)            int x; cin>>x; while(x--)
mt19937                 rng(chrono::steady_clock::now().time_since_epoch().count());
#define fastio          ios_base::sync_with_stdio(0); cin.tie(0);

int findEarlisetMonth(vector<int> a)
{
    int n=a.size(),ans_diff,ans_m=0;
    for(int i=1;i<n;i++) a[i]+=a[i-1];
    ans_diff = a[0] - ((a[n-1]-a[0])/(n-1));
    ans_diff=abs(ans_diff);
    ans_m=0;
    for(int i=1;i<=n-2;i++)
    {
        int temp = ((a[i])/(i+1)) - ((a[n-1]-a[i])/(n-i-1));
        temp=abs(temp);
        if(temp<ans_diff){
            ans_diff=temp;
            ans_m=i;
        }
    }
    return ans_m+1;
}


int32_t main()
{
    vector<int> a={1,3,2,3};
    cout<<findEarlisetMonth(a)<<endl;
return 0;
}