#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <cstdio>
#include <cmath>

using namespace std;

int main() {

	long long p,q, cnt  = 1, ans = 0;
	cin >> p;
	q = pow(2, p) - 1;
	for (int i = 0; i < 60; i++) {
		ans += (q >> i) & 1;
	}

	cout << ans << endl;

	return 0;
}