#include<bits/stdc++.h>
using namespace std;
int main()
{
	int n;
	cin>>n;
	long long a[60];
	a[7]=n;
	for(int i=6;i>=1;i--)
	{
		a[i]=(a[i+1]+2)*2;
	}
	cout<<a[1];
	return 0;
}
/**************************************************************
	Problem: 1688
	User: chenkexin
	Language: C++
	Result: Accepted
	Time:4 ms
	Memory:2072 kb
****************************************************************/