#p1085
#解法1
n=int(input())
s=0
for i in range(1,n+1):
    t=1
    for j in range(1,i+1):
        t=t*j
    s+=t
print(s)
#解法2
n = int(input())
jie = 1
sum = 0
i = 1
while n >= i:
    jie= jie * i
    sum = sum + jie
    i = i + 1
print(sum)