Factorial of a Number

Problem Statement

In this challenge, you must find the factorial of a given number.

If n is the given number, then the factorial of n is given by the following formula.

n! = 1 * 2 * 3 * ... * n

Input

The first line of input consists of an integer n, where n>=0.

Output

Print the factorial of given number.

As is

The boilerplate code is already there to read the input from user, in the main() function, and to print the value returned by the factorial() function. Do not edit this code.

To do ✍

factorial() has one parameter: n. Complete the function that computes the factorial of given number, and return the result.

Example 1

Test input

5

Test output

120

Explanation

5! = 1 * 2 * 3 * 4 *5
   = 120

Example 2

Test input

3

Test output

6

# Complete the following function
def factorial(n):
    

# Boilerplate code - Do not edit the following
def main():
    n = int(input())
    print(factorial(n))

if __name__ == "__main__":
    main()

1

1

5

120

7

5040

10

3628800

0

1

# Complete the following function
def factorial(n):
    if n == 0:
        return 1
    else:
        result = 1
        for i in range(1, n+1):
            result *= i
        return result

# Boilerplate code - Do not edit the following
def main():
    n = int(input())
    print(factorial(n))

if __name__ == "__main__":
    main()