Factorial of a Number Using Recursion
Compute the factorial of a given number using recursion.
Input format
A single integer N (0 ≤ N ≤ 18).
Output format
Print N! (factorial of N).
Constraints
- Values fit in a 64-bit signed integer
- Trailing whitespace and a trailing newline are ignored by the judge
Read from stdin, write to stdout. Sample cases below show the exact format.
Sample cases
Example 1
Input
0Expected output
1Example 2
Input
1Expected output
1