XOR of Sums

Coding

$(6)$ UNSOLVED

Problem Statement

Ravi is playing a game in which he needs to convert an array into an integer. This task seems to be impossible, but Ravi has an$-$algorithm to carry out this conversion.

Take the sum of odd$-$indexed elements

Take the sum of even indexed elements

Take the XOR of both sums

This is how Ravi converts the array into an integer. Write a program to carry this task out for Ravi,

Input Format

The first line of input contains an integer $N$

Next $N$ lines of input contain an integer each, the elements of the array.

Constraints

$1N{10}^5$

$1A[i]{10}^9$

Output Format

Print a single integer, the answer to the problem.

Evaluation Parameters

Sample Input

$5$

$1$

$2$