#include<iostream>
#include<string>
using namespace std;

int main_1(){
	int n; cin>>n;
	int a[22];
	a[n] = 1;
	for(int i=n-1; i>=1; i--)
		a[i] = 2 * (a[i+1] + 1);
	cout<<a[1];	
	return 0;
} 

void solve(int n){
	int x=1;
	for(int i=n-1; i>=1; i--) x = 2*(x+1);
	cout<<x<<endl;	
}
int main(){
//	for(int i=1; i<=200; i++) solve(i); // 测试数据是否发生溢出 
	int n; cin>>n;
	solve(n); 
	return 0;
}