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. Ace It!

time limit per test

2 secondsmemory limit per test

64 megabytesinput

standard inputoutput

standard outputInput

The only line of the input is a string of 7 characters. The first character is letter A, followed by 6 digits. The input is guaranteed to be valid (for certain definition of "valid").

Output

Output a single integer.

Examples

Input

A221033

Output

21

Input

A223635

Output

22

Input

A232726

Output

23

Codeforces (c) Copyright 2010-2017 Mike Mirzayanov

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