#include <iostream>
#include <cmath>
using namespace std;

int main()
{
    int p;
    cin >> p;
    
    p = pow(2,p) - 1;

    int ans = 0;
    while(p != 0){
        if(p % 2 != 0) ans++;
        p /=2;
    }

    cout << ans << endl;

    return 0;
}