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.
\InputFile
One positive integer $n~(n \le 27)$.
\OutputFile
Print the number of required lucky tickets.
Input example #1
1
Output example #1
9