# -*- coding: utf-8 -*-
# メモ
# TLE解


from collections import Counter


def solve(N, start):
    year = 1
    day = 0
    count = Counter()
    for i in xrange(7):
        count[i] = 0

    while year <= N:
        if year % 400 == 0:
            day += 366
        elif year % 100 == 0:
            day += 365
        elif year % 4 == 0:
            day += 366
        else:
            day += 365

        if year > start:
            count[day % 7] += 1
        year += 1
    return count


if __name__ == '__main__':
    N = int(raw_input())
    c = solve(N, 2014)
    print c[3]