Factorial
Completed
Read n (0 ≤ n ≤ 30) and print n! (the product 1 × 2 × … × n; 0! = 1).
Input
One integer.
Output
n!
Example
Input
5
Output
120
Editor
Python
Hints
Start the product at 1, not 0.
Solution explanation
Python integers have no size limit, so 30! prints exactly.
Show solution
n = int(input())
result = 1
for i in range(2, n + 1):
result *= i
print(result)