import java.util.Scanner;
public class FindSingleNumber {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int[] nums = new int[n];
for (int i = 0; i < n; i++) {
nums[i] = sc.nextInt();
}
System.out.println(singleNumber(nums));
}
public static int singleNumber(int[] nums) {
int result = 0;
for (int i = 0; i < 32; i++) {
int sum = 0;
for (int num : nums) {
if (((num >> i) & 1) == 1) {
sum++;
}
}
if (sum % 3 != 0) {
result |= (1 << i);
}
}
return result;
}
}