// Keses

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

int main () {
	// Measure execution speed (1)
	clock_t start, end;
	
	int N;
	cin >> N;
	long T[N];
	set <long> heard;
	for (int i = 0; i < N; i ++) {
		cin >> T[i];
		heard.insert(T[i]);
	}
	
	// Measure execution speed (2)
	start = clock();
	
	for (int i = N-1; i >= 0; i --) {
		heard.erase(T[i]);
		if ((int) heard.size() == 0) {
			cout << i+1;
			break;
		}
	}	
	
	// Measure execution speed (3)
	end = clock();
	double time_taken = double (end - start);
	cout << "\n( " << time_taken << " / " << CLOCKS_PER_SEC << " = " << time_taken / CLOCKS_PER_SEC << " sec )\n";
}