#include<bits/stdc++.h>
using namespace std;
int main()
{
	unsigned long long a,b,c[1000];
	cin>>a;
	c[1]=1;
	for(b=2;b<=a;b++)
	{
		c[b]=2*c[b-1];
		c[b]+=1;
	}
	c[a]*=2;
	cout<<c[a];
	return 0;
}

后三个点WA了╮(╯▽╰)╭