// UUID: f47c4b54-1358-4f6d-913c-ebf68a70616c
#include <bits/stdc++.h>
using namespace std;

#define ll long long

int main() 
{
    ios::sync_with_stdio(false);
    cin.tie(0);

    int n;
    cin >> n;

    map<int,int> m;    
    vector <int> v;

    for(int i = 0; i < n; i++)
    {
        int x;
        cin >> x;
        v.push_back(x);
        m[x]++;
    }
    
    int r = n-m.size();      //biztos n?
    for (int i = n-1; i >= 0; i--)
    {
        if(m[v[i]]!= 1)
            r--;
        if(r == 0)
        {
            cout << i+1 << '\n';
            break;
        }
    }


    return 0;
}