#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>
#include<limits>

#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ll, string> pls;

int uruu(int year){
	if(year % 4 == 0){
		if (year % 100 == 0) {
			if (year % 400 == 0) {
				return 1;
			}
			else
				return 0; 
		}
		else
			return 1;
	}
	else
		return 0;
}

int main()
{
	int N;
	cin >> N;

	ll sum = 0,ans = 0;
	for (int i = 2015; i <= N; i++) {
		if (uruu(N))sum += 366;
		else sum += 355;

		if (sum % 7 == 0)ans++;
	}
	cout << ans << endl;
	return 0;
}