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

import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        
        String[] first = br.readLine().split(" ");
        long N = Long.parseLong(first[0]);
        int T = Integer.parseInt(first[1]);
        int K = Integer.parseInt(first[2]);
        
        String[] second = br.readLine().split(" ");
        long[] a = new long[T];
        for (int i = 0; i < T; i++) {
            a[i] = Long.parseLong(second[i]);
        }
        
        int answer = -1;
        
        
        // INSERT YOUR CODE HERE
        
        
        System.out.println(answer);
    }
}