计算3位数字的阶乘和

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

def calculate_factorial_sum():
    total_sum = 0
    for num in range(100, 1000):
        num_factorial = factorial(num)
        total_sum += num_factorial
    return total_sum

factorial_sum = calculate_factorial_sum()
print("3位数字的阶乘和为:", factorial_sum)