using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
int n, k = 1;
double z;
float sum, p;
n = Console.Read();
for (int i = 0; i < n; i+=2)
{
sum += p;
for (int j = 0; j < n; j++)
{
p *= (3 * k + 2);
}
}
}
}
}