sum = 0！+ 1！+ ... + n！，输入n，输出sum。

n = int(input())
j = 1
sum = 0
i = 1
while n >= i:
    j = j * i
    sum = sum + j
    i = i + 1
print(sum)

def fun(n):
    if n == 1:
        return 1
    if n == 0:
        return 0
    else:
        return n * fun(n - 1)
n = int(input())
sum = 0
for i in range(1,n + 1):
    sum = sum + fun(i)
print(sum)