#include <iostream>
 
 
bool findElement ( int * arr , int * arrEnd , int value) {
    for ( ; arr != arrEnd ; ++arr )
        if ( *arr == value )
            return true ;
    return false ;
}
 
int get_count ( int * arr , int size ) {
    int count = 0 ;
    for ( int * currentElement = arr , * endElement = arr + size ; currentElement != endElement ; ++ currentElement ) {
        if ( ! findElement ( arr , currentElement , *currentElement ) && findElement ( currentElement + 1 , endElement, *currentElement )  ) {
            ++count ;
        }
    }
    return count ;
}
 
int main() {
    const int size = 16 ;
    int arr [ size ] = { 6, 1 , 2 , 3 , 1 , 1 , 3 , 2 , 4 , 1, 5 , 6 , 7 , 7 , 0 , 4 } ;
    std :: cout << get_count ( arr , size ) << std :: endl ;
}

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