#include<bits/stdc++.h>
using namespace std;
long long s=1;
long long n;
int main(){
	cin>>n;
	for(int i=1;i<n;i++){
		s=s*2+1;
	}
	cout<<s;
}
///
///    	   __  __          __  
/// 	  / / / /_  ______/ /________ 
///      / /_/ / / / / __  / ___/ __ \
/// 	/ __  / /_/ / /_/ / /  / /_/ /
///    /_/ /_/\__, /\__,_/_/   \____/ 
///          /____/                   
///