#include <bits/stdc++.h>

using namespace std;
#define int long long
using pii = pair <int, int>;
#define ff first
#define ss second
#define sz(x) ((int) (x).size())
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

template <typename T1, typename T2>
void mxr(T1& a, const T2& b) {
    if (b > a) {
        a = b;
    }
}

template <typename T1, typename T2>
void mnr(T1& a, const T2& b) {
    if (b < a) {
        a = b;
    }
}

signed main() {
    ios_base::sync_with_stdio(false);
#ifdef BUY
    freopen("inputik.txt", "r", stdin);
    freopen("outputik.txt", "w", stdout);
#else
    cin.tie(nullptr);
#endif

    int n; cin >> n;
    int f = 3;
    for (int i = 1970; i < n; ++i) {
        if (i % 400 == 0 || i % 4 == 0 && i % 100 != 0) {
            f = (f + 366) % 7;
        }
        else {
            f = (f + 365) % 7;
        }
    }

    vector <int> len = {
            31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
    if (n % 400 == 0 || n % 4 == 0 && n % 100 != 0) {
        len[1] = 29;
    }

    int ans = 0;
    for (int i = 0; i < 12; ++i) {
        ans += (f + len[i] - 1) / 7 + 1;
        f = (f + len[i]) % 7;
    }

    cout << ans;
}