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Calculate factorial of a given number N.
Explanation: 1 * 2 * 3 * 4 * 5 = 120.
You don't need to read or print anything. Your task is to complete the function find_fact() which takes n as input parameter and returns factorial of N.
Expected Time Complexity: O(N)
Expected Space Complexity: O(1)
1 <= N <= 18
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