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Mohammad Hafijul Islam
Mohammad Hafijul Islam

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Day 1: Functions Solution

Task

Implement a factorial function with one parameter: an integer, n. It must return the value of n! (i.e., n factorial).

Constraints

  • 1 ≤ n ≤ 10

Input Format

Locked stub code in the editor reads a single integer, n, from stdin and passes it to a factorial function.

Output Format

The function must return the value of n!.

Sample

Input

4
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Output

24
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Explanation

We return the value of 4! = 4x3x2x1 = 24.

Solution

Functions

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