#include<stdio.h>
int n;
int fun(int i)
{
	if(i == 7)	return n;
	else{
		return (fun(i+1)+2)*2;
	}
}
int main()
{
	scanf("%d",&n);
	
	printf("%d",fun(1));
	return 0;
}
/**************************************************************
	Problem: 1688
	User: admin
	Language: C
	Result: Accepted
	Time:5 ms
	Memory:1144 kb
****************************************************************/