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# 13 Floors

Bill is responsible for labeling all the floors on a new skyscraper. He’s superstitious, so he wants to skip floor 13 while labeling the floors. This means that the $12^\text {th}$, $13^\text {th}$, and $14^\text {th}$ floors should be labeled $12$, $14$, and $15$, respectively. Given the true floor number, can you tell Bill what to label that floor?

## Input

The input is a single positive integer $x \leq 1\, 000\, 000$ representing the true floor number.

## Output

The output is a single positive integer, which is the label for the corresponding floor in the input.

Sample Input 1 Sample Output 1
12

12

Sample Input 2 Sample Output 2
13

14

Sample Input 3 Sample Output 3
14

15

CPU Time limit 1 second
Memory limit 1024 MB