#include <bits/stdc++.h>
#define REP(i,n,N) for(int i=(n);i<(int)N;i++)
#define p(s) cout<<(s)<<endl
typedef long long ll;
using namespace std;

int main(){
	ll N;
	cin >> N;
	ll day = 0;
	ll after = N - 2014;
	ll ans = 0;
	ll mul = after/2800;
	ans += mul * 399;
	after %= 2800;

	REP(i,0,after){
		int 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 ++;
	}
	cout << ans << endl;
	return 0;
}