Source

This problem is adapted from Long Long OJ. All rights reserved.

Problem Description

Given a year $y$ ($1949\le y\le 2023$), output how many years the People's Republic of China had been founded by October 1st of that year.

Input Format

A single line containing a positive integer $y$.

Output Format

A single line with a positive integer representing the answer.

Samples

1949

0

2023

74