import java.util.*;
public class Main {
public static int print_last_index(int arr[] , int si , int M){
if(si == arr.length-1)
return -1 ;
int index = print_last_index(arr , si+1 , M);
if(index == -1){
if(arr[si] == M){
return si ;
}
else {
return -1 ;
}
}
else{
return index ;
}
}
public static void main(String args[]) {
int arr[] = {0 ,5 ,4 ,3, 88, 66, -67, 78};
int ans = print_last_index(arr , 0 , 22);
System.out.println(ans);
}
}