#include<iostream>
using namespace std;

int leap_year(int n)
{
	int count = 0, sum = 0;
	for (int i = 1; i <= n; i++)
	{
		if ((2014 + i) % 4 == 0)
		{
			if ((2014 + i) % 100 == 0)
			{
				if ((2014 + i) % 400 == 0) count += 2;
				else count++;
			}
			else count += 2;
		}
		else count++;

		if (count % 7 == 0)	sum++;
	}
	return sum;
}

int main()
{
	long long n;
	int period, x;

	cin >> n;

	period = (n - 2014) / 400;
	x = (n - 2014) % 400;

	cout << leap_year(400) * period + leap_year(x) << endl;
}