#include <fstream>

using namespace std;
ifstream fin("ntri.in");
ofstream fout("ntri.out");
int vec[1001];

int main() {
    int n;
    fin >> n;

    bool iesire = false;
    int contor = 0;

    for (int i = 1; i <= n; i++)
    {
        fin >> vec[i];
    }

    for (int i = 1; i <= n; i++)
    {
        for (int ii = i; ii <= i + 2; ii++)
        {
            if (vec[ii] == vec[n])
            {
                iesire = true;
            }
        }
        contor++;
        if (iesire == true)
        {
            break;
        }
    }

    fout << contor;
}