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

#include <stdio.h>
#include <stdlib.h>

int main(void) {
    long long N;
    int T, K;
    
    if (scanf("%lld %d %d", &N, &T, &K) != 3) {
        return 1;
    }
    
    long long *a = (long long *)malloc(T * sizeof(long long));
    for (int i = 0; i < T; i++) {
        scanf("%lld", &a[i]);
    }
    
    int answer = -1;
    
    
    /* INSERT YOUR CODE HERE */
    
    
    printf("%d\n", answer);
    
    free(a);
    return 0;
}