#include <bits/stdc++.h>
using namespace std;

void solve() {
    int n;
    cin >> n;
    vector<int> v(1 + n, 0);
    set<int> s;
    for(int i = 1; i <= n; i++) {
        cin >> v[i];
        s.insert(v[i]);
    }
    int diff_cnt = s.size();
    s.clear();
    for(int i = n; i >= 1; i--) {
        s.insert(v[i]);
        if(diff_cnt == int(s.size())) {
            cout << i << "\n";
            return;
        }
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}