Package for this problem was not updated by the problem writer or Codeforces administration after we’ve upgraded the judging servers. To adjust the time limit constraint, solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then value 800 ms will be displayed and used to determine the verdict.

The following languages are additionally available for the problems from the contest

April Fools Day Contest:

- Secret_171

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

F. ucyhf

time limit per test

2 secondsmemory limit per test

64 megabytesinput

standard inputoutput

standard outputqd ucyhf yi q fhycu dkcruh mxeiu huluhiu yi q tyvvuhudj fhycu dkcruh. oekh jqia yi je vydt jxu djx ucyhf.

Input

jxu ydfkj sediyiji ev q iydwbu ydjuwuh *d* (1 ≤ *d* ≤ 11184) — jxu edu-rqiut ydtun ev jxu ucyhf je vydt.

Output

ekjfkj q iydwbu dkcruh.

Examples

Input

1

Output

13

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: May/25/2017 19:12:53 (p1).

Desktop version, switch to mobile version.
User lists

Name |
---|