
    Calculate a client's loyalty program achievement score by taking the sum of squares of their first n completed even-numbered savings milestones (in thousands of dollars). For example, if a client has reached 3 milestones ($2000, $4000, and $6000), their achievement score would be calculated as (2^2 + 4^2 + 6^2).
    

    
def square_Sum(n):
    """
    Calculate a client's loyalty program achievement score by taking the sum of squares of their first n completed even-numbered savings milestones (in thousands of dollars). For example, if a client has reached 3 milestones ($2000, $4000, and $6000), their achievement score would be calculated as (2^2 + 4^2 + 6^2).
    

    """
def square_Sum(n):
    """
    Calculate a client's loyalty program achievement score by taking the sum of squares of their first n completed even-numbered savings milestones (in thousands of dollars). For example, if a client has reached 3 milestones ($2000, $4000, and $6000), their achievement score would be calculated as (2^2 + 4^2 + 6^2).
    

    """
    return int(2 * n * (n + 1) * (2 * n + 1) / 3)