class Solution:
    def clumsy(self, n: int) -> int:
        if n <= 3:
            return [1,2,6][n-1]
        def getSum(n):
            if n <= 3:
                return [0,1,2,6][n]
            return n*(n-1)//(n-2) - (n-3) + getSum(n-4)

        return n*(n-1)//(n-2) + (n-3) - getSum(n-4)