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.

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E. Twisted Circuit

time limit per test

2 secondsmemory limit per test

64 megabytesinput

standard inputoutput

standard outputInput

The input consists of four lines, each line containing a single digit 0 or 1.

Output

Output a single digit, 0 or 1.

Example

Input

0

1

1

0

Output

0

Codeforces (c) Copyright 2010-2019 Mike Mirzayanov

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