public class List1 {
    public static void main(String[] args) {

	Person p1 = new Person("A");
        Person p2 = new Person("B");
        Person p3 = new Person("C");

	p2.friend = p3;
	p1.friend = p2;

	System.out.println(count(p1));

    }

    public static int count(Person p) {
	int count = 0;
	Person head = p;
	while (head != null) {
	    count++;
	    head = head.friend;
	}
	return count;
    }

}

// very poorly styled list class!
class Person { 
    public String name;
    public Person friend;
    public Person(String name) {this.name=name;}
    public String toString() {return name;}
}