#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,s=1;
	cin>>n;
	for(int i=1;i<=n;i++){
		s=s*2;
	}
	cout<<s-1;
	return 0;
}
/**************************************************************
	Problem: 1223
	User: panyuchen
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/