#define _USE_MATH_DEFINES
#include <algorithm>
#include <cstdio>
#include <functional>
#include <iostream>
#include <cfloat>
#include <climits>
#include <cstring>
#include <cmath>
#include <map>
#include <queue>
#include <set>
#include <sstream>
#include <stack>
#include <string>
#include <time.h>
#include <vector>
using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> i_i;
typedef pair<ll, int> ll_i;
typedef pair<double, int> d_i;
typedef pair<ll, ll> ll_ll;
typedef pair<double, double> d_d;
struct edge { int u, v; ll w; };

ll MOD = 1000000007;
ll _MOD = 1000000009;
double EPS = 1e-9;

bool is_uruu(ll y) {
	if (y % 400 == 0) return true;
	if (y % 100 == 0) return false;
	if (y % 4 == 0) return true;
	return false;
}

int main() {
	int Y = 0, X = 0, K = 0;
	for (;;) {
		if (Y > 0 && Y % 400 == 0 && X == 0) break;
		if (X == 0) K++;
		X += is_uruu(Y + 1) ? 2 : 1;
		X %= 7;
		Y++;
	}
	Y *= 10000; K *= 10000;
	ll N; cin >> N;
	int x = 0; ll k = 0;
	for (ll y = 2014; y <= N;) {
		if (y % 400 == 0 && y + Y <= N) {
			k += K;
			y += Y;
		}
		else {
			if (x == 0) k++;
			x += is_uruu(y + 1) ? 2 : 1;
			x %= 7;
			y++;
		}
	}
	cout << k - 1 << endl;
}