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Summary

Read a positive integer X between 1 and 100 and print the remainder when X is divided by 21.

Level: Easy1 of 10
Topics: Math, Implementation
Solved: No attempts yet

Problem

A positive integer X is given. Print the remainder when X is divided by 21.

Input

The input is given from standard input in the following format.

Output

Print the remainder when X is divided by 21.

Constraints

1 ≦ X ≦ 100.
X is an integer.

Examples3

Example 1
Input
```
50
```
Expected output
```
8
```
Example 2
Input
```
42
```
Expected output
```
0
```
Example 3
Input
```
5
```
Expected output
```
5
```

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