//No.87 Advent Calendar Problem

import java.util.*;
import java.io.*;
import static java.util.Arrays.*;
import static java.lang.Math.*;

public class No87 {
    
    static final Scanner in = new Scanner(System.in);
    static final PrintWriter out = new PrintWriter(System.out,false);

    static void solve() {
        long n = in.nextLong()-2014;
        int w = zeller(2014,7,23);
        long cnt = n/400*57;
        n %= 400;
        
        for (int i=2015; i<2015+n; i++) {
            if (w == zeller(i,7,23)) cnt++;
        }
        out.println(cnt);
    }

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

    public static void main(String[] args) {
        long start = System.currentTimeMillis();

        solve();
        out.flush();

        long end = System.currentTimeMillis();
        //trace(end-start + "ms");
        in.close();
        out.close();
    }

    static void trace(Object... o) { System.out.println(deepToString(o));}
}