// UUID: ddfa0ce2-1127-4900-8de8-6558c8473950
#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n; 
	set < int > date; 

	vector < int > d(n); 

	for(int i = 0; i < n; i++){
		cin >> d[i]; 
	}
	int curr = 0; 

	for(int i = n - 1; i >= 0; i--){
		//cout << i << endl; 
		if(date.count(d[i]) == 0){
			curr = i + 1;
			date.insert(d[i]);
		}

	}
	
	cout << curr; 
}