#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);i++)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) (v).begin(),(v).end()
#define fi first
#define se second
template<typename A, typename B> inline bool chmax(A &a, B b) { if (a<b) { a=b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a>b) { a=b; return 1; } return 0; }
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<int, pii> pip;
const ll INF = 1e9+100;
const ll MOD = 1e9+7;
const double EPS  = 1e-10;
const bool debug = 0;
//---------------------------//

ll N;

ll ncr(ll n, ll r) {
	if (n < r || n < 0 || r < 0) return 0;
	ll res = 1, c = 1;
	
	for (ll i = n; i >= n - r + 1; i--) {
		res *= i;
		
		if (c <= r) res /= c++;
	}
	while (c <= r) res /= c++;
	
	return res;
}

int main() {
	cin >> N;
		
	if (N <= 8) {
		ll ans = 0;
		REP(i, N + 1) if (ncr(N, i) % 2 == 0) ans++;
		cout << ans << endl;
	}
	else cout << N - 3 << endl;
	
	return 0;
}