#include <iostream>
#include <vector>
#include <set>
using namespace std;

int main()
{
    int n;
    cin >> n;
    vector <int> v(n);
    set <int> t;
    for (int i = 0; i < n; i++)
    {
        cin >> v[i];
        t.insert(v[i]);
    }
    int i = n - 1;
    while (!t.empty())
    {
        if (t.count(v[i]))
        {
            t.erase(v[i]);
        }
        i--;
    }
    cout << i+2;
    return 0;
}