struct Node{
	int value;
	Node* next;
};

int average(Node* p){
	
	int sum = 0;
	int n = 0;
	if(p == nullptr) //nullptr => NULL (nullptr == c++11)
		return 0;
	while(p != nullptr){ //nullptr => NULL (nullptr == c++11)
		sum += p->value;
		p = p->next;
		++n;
	}
	return (sum/n);
	
}