Problems
The number of permutations
The number of permutations
Given an integer $n$, find the number of different permutations of numbers from $1$ to $n$.
\InputFile
One integer $n\:(1 \le n \le 12)$.
\OutputFile
Print the number of different permutations of numbers from $1$ to $n$.
Input example #1
3
Output example #1
6