#include <iostream>
#include <set>

using namespace std;

int main()
{
    unsigned int n, minp=0;
    cin >> n;
    int a[n];
    set<int> evek;

    for(unsigned int i=0; i<n; i++) {
        cin >> a[i];
        evek.insert(a[i]);
    }
    minp=evek.size();
    evek.clear();
    int z=n;
    while(evek.size()<minp) {
        evek.insert(a[z]);
        z--;
    }
    cout << ++z;
    return 0;
}