#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int main() {
    int i, d, cnt, ans;
    ll n;
    cin >> n;
    cnt = d = 0;
    rep (i,400) {
        int y = i + 2015;
        if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0)
            d += 2;
        else
            d++;
        if (d % 7 == 0)
            cnt++;
        if ((n - 2015) % 400 == i)
            ans = cnt;
    }
    ans += (n - 2015) / 400 * cnt;
    cout << ans << endl;
    return 0;
}