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

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

    N -= 2014;
    long long memo[410] = {};
    long long sum = 0;
    for (int i = 0; i < 400; i++) {
        int day = 0;
        int n = i + 2015;
        if (n % 400 == 0) {
            day += 366;
        } else if (n % 100 == 0)
            day += 365;
        else if (n % 4 == 0)
            day += 366;
        else
            day += 365;
        sum += day;
        sum %= 7;
        if (i > 0)
            memo[i + 1] = memo[i] + (sum == 0);
    }

    long long ans = 0;

    ans += (N / 400) * memo[400];
    N %= 400;
    ans += memo[N];

    cout << ans << endl;
}