def factorial(n):
    result = 1
    for i in range(1,n+1):
        result = result * i
    return result

n=int(input("请输入n:"))
result = factorial(n)
print(f"{n}!={result}")
def factorial(n):
    result = 1
    for i in range(1,n+1):
        result = result * i
    return result

n=int(input("请输入n:"))
result = factorial(n)
print(f"{n}!={result}")