#include
using namespace std;
int main()
{
int i, n, x;
cin >> n;
for (i = 1, x = 1; i < n; i++)
x = (x + 1) * 2;
cout << x;
return 0;
}
#include
using namespace std;
int main()
{
int i, n, x;
cin >> n;
for (i = 1, x = 1; i < n; i++)
x = (x + 1) * 2;
cout << x;
return 0;
}
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