Given two positive integers X and Y. You have to add two integers and output their sum.

Example 1:

Input:
X = 3, Y = 4
Output:
7
Explanation:
Sum of X and Y is 7

Example 2:

Input:
X = 8, Y = 2 
Output:
10
Explanation:
Sum of X and Y is 10.

Your Task:
Your task is to complete the function add() which accepts BigIntegers x and y as input parameters, and returns their sum.

Constraints:
1 <= X, Y <= 10³⁰