import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

   static BigInteger factorial(int N)
    {
        // Initialize result
        BigInteger f = new BigInteger("1"); // Or BigInteger.ONE
 
        // Multiply f with 2, 3, ...N
        for (int i =1; i <= 3; i++)
            f = f.multiply(BigInteger.valueOf(N));
 
        return f;
    }
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int k = in.nextInt();
        
        System.out.println(factorial(k));
        in.close();
    }
}