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

int bitCount(int b){
   b = (b & 0x55555555) + (b >> 1 & 0x55555555);
   b = (b & 0x33333333) + (b >> 2 & 0x33333333);
   b = (b & 0x0f0f0f0f) + (b >> 4 & 0x0f0f0f0f);
   b = (b & 0x00ff00ff) + (b >> 8 & 0x00ff00ff);
   return (b & 0x0000ffff) + (b >> 16);
}

int main(){
   int p;
   cin >> p;
   cout << bitCount((unsigned long long)(pow(2,p)) - 1) << endl;
}