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

using i64 = long long;

int main() {
    cin.tie(nullptr)->sync_with_stdio(false);

    auto solve = [&]() {
        int n;
        cin >> n;

        vector<int> a(n - 1);
        int z = 0;
        bool good = true;

        for (int i = 0; i < n - 1; i++) {
            cin >> a[i];
            if (i == 0 || a[i] == 1) {
                z = 0;
            } else {
                z++;
                good = false;
            }
        }

        if (z == 0) {
            if (good) {
                cout << "1\n";
            } else {
                cout << "2\n";
            }
        } else {
            cout << z + 1 << '\n';
        }
    };
    
    solve();
    
    return 0;
}