#include<cmath> #include<iostream> #include<cstring> using namespace std; int main() { long long n,a[110],sum=0; cin>>n; a[1]=1; a[2]=2; for(int i=2;i<=n;i++) { a[i]=a[i-1]*2; sum=sum+a[i]; } cout<<sum+1; return 0 ; }