# Number of even numbers

Very easy

Execution time limit is 1 second

Runtime memory usage limit is 64 megabytes

The program receives a natural number n as input. Your task is to output the count of even natural numbers that are less than or equal to n.

## Input

A natural number n, where n does not exceed `10^18`

.

## Output

The solution to the problem.

## Examples

Input #1

Answer #1

Input #2

Answer #2

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