HDOJ2013

#include <iostream> 
#include <cstring>
#include <string>
#include <cstdio>
#include <algorithm>
#include <stack>
#include <math.h>


using namespace std;


int main()
{
int d;
while (cin >> d)
{
int s = 1;
for (int i = d - 1; i > 0; i--)
{
s += 1;
s *= 2;
}
cout << s << endl;
}
}