#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;

int main(){
	int i, j;
	int p;

	cin >> p;

	long long num = pow(2, p) - 1;

	vector<int>list;

	while (true)
	{
		list.push_back(num % 2);
		num /= 2;

		if (num == 0) break;

	}

	int cnt = 0;

	for (i = list.size()-1; i >=0; i--) {
		if (list[i] == 1)cnt++;

	}

	cout << cnt << endl;





	getchar();
	getchar();
	return 0;
}