#include <iostream>
using namespace std;

int main(){
	int s = 1;
	int n,i;
	cin>>n;
	for(i = 1;i < n;i++){
		s = 2 * s + 1;
	}
	
	cout<<s<<endl;
}
/**************************************************************
	Problem: 1223
	User: admin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/