/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int[] arr = {2, 3, 5, 3, 2};

        int result = 0;
        for (int num : arr) {
            result ^= num;
        }

        System.out.println("Unique element: " + result);
	}
}