#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;
}