# 13 Floors

## 문제

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 th, 13 th, and 14 th floors should be labeled 12, 14, and 15, respectively. Given the true floor number, can you tell Bill what to label that floor?

## 입력

The input is a single positive integer x≤1 000 000 representing the true floor number.

## 출력

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

## 예제 입력 1 복사

    12

## 예제 입력 2 복사

    13

## 예제 입력 3 복사

    14

## 예제 출력 1 복사

    12

## 예제 출력 2 복사

    14

## 예제 출력 3 복사

    15