Problems

# Lucky tickets

# Lucky tickets

Find the number of lucky tickets with the sum of the first three digits **n**. Ticket is called lucky if it is a six-digit number and the sum of the first three digits equals to the sum of the last three digits.

#### Input

One positive integer **n** (**n** ≤ **27**).

#### Output

Print the number of required lucky tickets.

Input example #1

1

Output example #1

9