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# Solve 7n By 8

1. You are given a number n. 2. You have to calculate the value of 7n/8 without using division and multiplication.

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# Solve 7n By 8

easy

1. You are given a number n. 2. You have to calculate the value of 7n/8 without using division and multiplication.

1 <= n <= 10^9

## Format

A number n

### Output

Check the sample ouput and question video.

## Example

Sample Input

15

### Sample Output

13

Question Video

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