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

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