a=int(input())
sum=1
max=0
for i in range(1,a+1):
for j in range(1,i+1):
sum=j*sum
max=max+sum
sum=1
print(max)
微信扫一扫
a=int(input())
sum=1
max=0
for i in range(1,a+1):
for j in range(1,i+1):
sum=j*sum
max=max+sum
sum=1
print(max)
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