# -*- coding: utf-8 -*-
from datetime import datetime

# 1. 入力情報取得.
Y = int(input())

# 2. 年齢は？
# Pythonic difference between two dates in years?
# https://stackoverflow.com/questions/4436957/pythonic-difference-between-two-dates-in-years
date2 = datetime(2017, 6, 23, 0, 0)
date1 = datetime(Y, 1, 1, 0, 0)
delta = date2 - date1
ans = int((delta.days + delta.seconds/86400)/365.2425)

# 3. 出力.
print(ans)