#include <bits/stdc++.h>
#define ll long long
#define ff first
#define ss second
#define ld long double
#define pb push_back
#define sws cin.tie(0)->sync_with_stdio(false);
#define endl '\n'

using namespace std;

const int N = 1e5+10;
const ll MOD = 998244353;
// const ll MOD = 1e9+7;
const int INF = 0x3f3f3f3f;
const ll LLINF = 0x3f3f3f3f3f3f3f3f;

int32_t main()
{
    #ifndef LOCAL
    sws;
    #endif

    auto is_leap = [&](int y) { return (y % 400 == 0 or (y % 4 == 0 and y % 100 != 0)); };

    int y; cin >> y;
    int year = 1970, day_week = 3; // quinta
    vector<int> months = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
    int days_in_year = accumulate(months.begin(), months.end(), 0);
    while (year < y) {
        day_week += days_in_year;
        if (is_leap(year)) day_week ++;
        day_week %= 7;
        year ++;
    }

    if (is_leap(year)) months[1] = 29;
    int ans = 0;
    for (int i=0;i<12;i++) {
        ans += (day_week + months[i] + 7 - 1) / 7;
        (day_week += months[i]) %= 7;
    }
    cout << ans << endl;


    return 0;
}