#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int zeller(int y, int m, int d)
{
    if(m <= 2){
        -- y;
        m += 12;
    }
    int j = y / 100;
    int k = y % 100;
    return (d + ((m+1)*26 / 10) + k + (k / 4) + (j / 4) + 5 * j) % 7;
}
/* 07/23 */

long long solve(long long n)
{
    int x = zeller(2014, 7, 23);

    vector<bool> v(400);
    int cnt = 0;
    for(int i=0; i<400; ++i){
        v[i] = zeller(i, 7, 23) == x;
        if(v[i])
            ++ cnt;
    }

    ++ n;
    long long ret = n / 400 * cnt;
    for(int i=0; i<n%400; ++i){
        if(v[i])
            ++ ret;
    }
    return ret;
}

int main()
{
    long long n;
    cin >> n;

    long long ret = solve(n) - solve(2014);
    cout << ret << endl;

    return 0;
}