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Given two linked list of size **N1** and **N2** respectively of distinct elements, your task is to complete the function **countPairs()**, which returns the count of all pairs from both lists whose sum is equal to the given value **X**.

**Note**: The 2 numbers of a pair should be parts of different lists.

**Example 1:**

**Input:
**L1 = 1->2->3->4->5->6
L2 = 11->12->13
X = 15
**Output: **3**
Explanation: **There are 3 pairs that
add up to 15 : (4,11) , (3,12) and (2,13)

**Example 2:**

**Input:
**L1 = 7->5->1->3
L2 = 3->5->2->8
X = 10
**Output: **2**
Explanation: **There are 2 pairs that add up
to 10 : (7,3) and (5,5)

**Your Task:**

You only need to implement the given function **countPairs() **and return the count.

**Expected Time Complexity:** O(N+M)

**Expected Auxiliary Space:** O(N+M)

**Constraints:**

1<=size of linked list<=10000

1<=X<=10000

**Note** : All elements in a linked list are unique.

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Count Pairs whose sum is equal to X

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