#include<iostream>
using namespace std;
int main()
{
int n;
while(cin>>n)
{
if(n!=1)
{
int k=1;
for(int i=0;i<n;i++)
{
k=(k+1)*2;
}
cout<<k<<endl;
}
else
{
cout<<"1"<<endl;
}
}
return 0;
}