1014: [编程入门]阶乘求和

解题思路:数据量小，直接按照正常思路走就行


参考代码:

def jiecheng(i):
   jieguo=1
   for j in range(1,i+1):
       jieguo*=j
   return jieguo
a=int(input())
count=0
for i in range(1,a+1):
   count+=jiecheng(i)
print(count)