125. Factorial
EasyMathBig Integer
Print n! exactly. (For n = 50 the answer has 65 digits, so use big integers.)
Input format
A single integer n.
Output format
n!
Example 1
Input
5
Output
120
Example 2
Input
0
Output
1
Constraints
0 ≤ n ≤ 100
Read input from standard input and print the answer to standard output. Your code is judged against 5 test cases, most of them hidden.
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