"""
Question 2
Question:
Write a program which can compute the factorial of a given numbers.The results should be printed
in a comma-separated sequence on a single line.
Suppose the following input is supplied to the program: 8
Then, the output should be:40320

Hints:
In case of input data being supplied to the question, it should be assumed to be a console input.
"""
# Using While Loop

n = int(input())

fact = 1
i = 1

while i <= n:
    fact = fact * i;
    i = i + 1
print(fact)
