// NOTE: it is recommended to use this even if you don't understand the following code.

#include <fstream>
#include <iostream>
#include <vector>

using namespace std;

int main() {
    // uncomment the two following lines if you want to read/write from files
    // ifstream cin("input.txt");
    // ofstream cout("output.txt");

    long long N;
    int T, K;
    cin >> N >> T >> K;

    vector<long long> a(T);
    for (int i = 0; i < T; ++i)
        cin >> a[i];

    int answer = -1;


    // INSERT YOUR CODE HERE


    cout << answer << endl;

    return 0;
}