class Calculator(AdvancedArithmetic):
    def divisorSum(self, n):
        l = []
        if n==1:
            l.append(1)
        for i in range(1,n//2):
            if n%i==0:
                p = n//i
                if i not in l:
                    l.append(i)
                if p not in l:
                    l.append(p)
        return sum(l)