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 ${12}^{\text{th}}$, ${13}^{\text{th}}$, 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?

입력

The input is a single positive integer $x\le 1000000$ 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