Please subscribe to the official Codeforces channel in Telegram via the link: https://t.me/codeforces_official.
×

Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

D. Varying Kibibits

time limit per test

3 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputYou are given *n* integers *a*_{1}, *a*_{2}, ..., *a*_{n}. Denote this list of integers as *T*.

Let *f*(*L*) be a function that takes in a non-empty list of integers *L*.

The function will output another integer as follows:

- First, all integers in
*L*are padded with leading zeros so they are all the same length as the maximum length number in*L*. - We will construct a string where the
*i*-th character is the minimum of the*i*-th character in padded input numbers. - The output is the number representing the string interpreted in base 10.

For example *f*(10, 9) = 0, *f*(123, 321) = 121, *f*(530, 932, 81) = 30.

Define the function

In other words, *G*(*x*) is the sum of squares of sum of elements of nonempty subsequences of *T* that evaluate to *x* when plugged into *f* modulo 1 000 000 007, then multiplied by *x*. The last multiplication is not modded.

You would like to compute *G*(0), *G*(1), ..., *G*(999 999). To reduce the output size, print the value , where denotes the bitwise XOR operator.

Input

The first line contains the integer *n* (1 ≤ *n* ≤ 1 000 000) — the size of list *T*.

The next line contains *n* space-separated integers, *a*_{1}, *a*_{2}, ..., *a*_{n} (0 ≤ *a*_{i} ≤ 999 999) — the elements of the list.

Output

Output a single integer, the answer to the problem.

Examples

Input

3

123 321 555

Output

292711924

Input

1

999999

Output

997992010006992

Input

10

1 1 1 1 1 1 1 1 1 1

Output

28160

Note

For the first sample, the nonzero values of *G* are *G*(121) = 144 611 577, *G*(123) = 58 401 999, *G*(321) = 279 403 857, *G*(555) = 170 953 875. The bitwise XOR of these numbers is equal to 292 711 924.

For example, , since the subsequences [123] and [123, 555] evaluate to 123 when plugged into *f*.

For the second sample, we have

For the last sample, we have , where is the binomial coefficient.

Codeforces (c) Copyright 2010-2018 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Dec/12/2018 20:57:12 (f2).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|