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Problem
Given a non-negative integer N, calculate and print its factorial. The factorial of N (denoted as N!) is the product of all positive integers less than or equal to N. 0! is defined as 1.
Input format
Input
input.txt
- A single integer N (0 ≤ N ≤ 10)
Output format
Output
output.txt
- A single integer: N!
Example
input
4
output
24
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Sample cases (from the problem)
Sample Case 1
Input
4
Expected output
24
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