// yukicoder: No.87 Advent Calendar Problem
// 2019.4.9 bal4u
// 曜日の計算。周期性の利用。

#include <stdio.h>
#include <stdlib.h>

#define MONTH 7
#define DAY 23
#define WEEK 3   // 水曜

int dayOfWeek(int year, int month, int day)
{
	if (month == 1 || month == 2) {
		year--;
		month += 12;
	}
	return (year + year / 4 - year / 100 + year / 400
		+ (13 * month + 8) / 5 + day) % 7;
}

int calc(int fr, int to)
{
	int f = 0;
	while (fr <= to) {
		if (dayOfWeek(fr, MONTH, DAY) == WEEK) f++;
		fr++;
	}
	return f;
}

int main()
{
	int ans;
	long long N;

	scanf("%lld", &N);
	if (N <= 4000) ans = calc(2015, (int)N);
	else {
		N -= 4000;
		ans = 282 + (int)(N / 2000) * 285;
		N %= 2000;
		ans += calc(4000, 4000+(int)N);
	}
	printf("%d\n", ans);
	return 0;
}