输入一个数，编写程序

def jcSums(num):
    if num==1:
        return 1
    else:
        jc_sums = 0
        for i in range(2,num+1):
            jc = 1
            for j in range(i,1,-1):
                jc = jc*j
            jc_sums = jc_sums+jc
        return jc_sums+1

print(jcSums(3))

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