#include<iostream>
#include<array>
#include<math.h>
using namespace std;


int main(void){
	double input = 0.0;
	int merusenu_sosu=0;
	cin >> input;
		merusenu_sosu=(int)pow(2,input)-1;
		//cout << merusenu_sosu << endl;
	int Sum2Shinsu = 0;
	while (merusenu_sosu >=1){
		
		Sum2Shinsu += merusenu_sosu%2;
		merusenu_sosu = merusenu_sosu / 2;
		
	}
	cout << Sum2Shinsu<<endl;
	system("pause");
	return 0;
}