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

template<typename T>
istream &operator>>(istream &is,vector<T> &a){
    for(auto &v : a) cin >> v;
    return is;
}
template<typename T>
ostream &operator<<(ostream &os,const vector<T> &a){
    if(a.size() == 0) return os;
    cout << a.at(0);
    for(int i=1; i<a.size(); i++) cout << " " << a.at(i);
    cout << "\n";
    return os;
}

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    auto leap = [&](long long x) -> int {
        if(x%400 == 0) return 2;
        else if(x%100 == 0) return 1;
        else if(x%4 == 0) return 2;
        else return 1;
    };

    long long N; cin >> N;
    long long s = 0,answer = 0;
    if(N <= 10000){
        for(int i=2015; i<=N; i++){
            s = (s+leap(i))%7;
            answer += s==0;
        }
        cout << answer << endl; return 0;
    }
    answer = 0,s = 0;
    for(int i=2015; i<4815; i++) s = (s+leap(i))%7,answer += s==0;
    long long left = N-4814;
    answer *= 1+left/2800; left %= 2800;
    for(int i=2015; i<left+2015; i++) s = (s+leap(i))%7,answer += s==0;
    cout << answer << endl;
}