求1!+3!+5!+.....+n!

n=int(input())
if n==_____(1)________:
    print(1)
else:
    aList=[]
    for i in range(1,n+1,2):
        s=1
        for j in range(1,_____(2)______):
            s*=j
        aList.append(_____(3)_____)
    print("%d"%(_____(4)______))

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