Reverse Factorial

import math

fact = [1] * 1000001

def inverseFactorial(n):
    if n <= 1:
        return 1
    return fact[n] * inverseFactorial(n - 1)

for i in range(1, 1000001):
    fact[i] = fact[i - 1] * i

n = int(input())
print(inverseFactorial(n))