[백준] 10872번: 팩토리얼 [Python]

복습하면서 그냥 풀어봤다.

 

def factorial(number):
    if (number == 0):
        return 1
    if (number == 1):
        return 1
    res = 1
    for i in range(2, number+1):
        res *= i
    return res
 
number = int(input())
 
res = factorial(number)
 
print(res)