import java.util.*;
/*
 public class ListNode {
    int val;
    ListNode next = null;

    ListNode(int val) {
        this.val = val;
    }
}
*/
public class Solution {

    public ListNode EntryNodeOfLoop(ListNode pHead) {
        
        while(pHead != null){
            if(pHead.val < 0){
                pHead.val = pHead.val + Integer.MAX_VALUE;
                return pHead; 
            }else{
                pHead.val = pHead.val - Integer.MAX_VALUE;
                pHead = pHead.next;
            }
        }
        return null;

    }
}