#include "bits/stdc++.h"
#define REP(i,n,N) for(ll i=(n); i<(N); i++)
#define RREP(i,n,N) for(ll i=(N-1); i>=n; i--)
#define CK(n,a,b) ((a)<=(n)&&(n)<(b))
#define ALL(v) (v).begin(),(v).end()
#define p(s) cout<<(s)<<endl
#define p2(a,b) cout<<(a)<<" "<<(b)<<endl
#define v2(T) vector<vector<T>>
typedef long long ll;
using namespace std;
const ll inf = 1e18+7;


int main(){
    ll N;
    cin >> N;
    ll day = 0;
    ll nokori = N - 2014;
    ll ans = 0;

    ll mul = nokori / 2800;
    ans += mul * 399;
    nokori %= 2800;
    REP(i, 0, nokori){
        ll y = 2015 + i;
        if (y % 400 == 0) day += 366;
        else if (y % 100 == 0) day += 365;
        else if (y % 4 == 0) day += 366;
        else day += 365;
        if (day % 7 == 0) ans++;
    }
    p(ans);

    return 0;
}