#include <bits/stdc++.h>
using namespace std;

#define int long long

vector<int> mo = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

bool isLeap(int year) {
	if (year % 400 == 0) return 1;
	if (year % 4 == 0 && year % 100 != 0) return 1;
	return 0;
}

int getDay(int month, int year) {
	if (month != 1) {
		return mo[month];
	} else {
		return mo[month] + isLeap(year);
	}
}

signed main() {
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n; cin >> n;
	int cur = 1970, day = 3;
	while (cur < n) {
		int da = isLeap(cur) ? 366 : 365;
		cur++; day += da; day %= 7;
	}

	int ans = 0;
	for (int i = 0; i < 12; i++) {
		int mo = getDay(i, n);
		int tmp = 1;
		while (mo--) {
			day++;
			if (day == 7) {
				day = 0;
				if (mo > 0) tmp++;
			}
		}
		ans += tmp;
		cerr << getDay(i, n) << ' ' << day << ' ' << tmp << '\n';
	}
	cout << ans << '\n';

	return 0;
}