#include <iostream>
using namespace std;
int main()
{
int n,sum=1;
while(cin>>n&&n>1)
{
while(n>=2)
{
sum=(sum+1)*2;
n--;
}
cout << sum << endl;
sum=1;
}
return 0;
}
using namespace std;
int main()
{
int n,sum=1;
while(cin>>n&&n>1)
{
while(n>=2)
{
sum=(sum+1)*2;
n--;
}
cout << sum << endl;
sum=1;
}
return 0;
}