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Problem B
13 Floors
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3.0.
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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 |
