
    Design a credit risk assessment function that evaluates multiple qualification tiers starting from an initial credit score threshold. The function should calculate the sum of scores across all qualifying tiers, where each subsequent tier reduces the score requirement by 2 points from the initial threshold. The assessment continues creating tiers until the adjusted score requirement would fall below the minimum acceptable level (zero). This tiered approach helps determine the total risk exposure when considering applicants across different credit score bands, with the calculation following the pattern: initial threshold + (threshold-2) + (threshold-4), and so on. The resulting sum represents the cumulative risk tolerance value across all viable lending tiers.
    

    
def sum_series(n):
    """
    Design a credit risk assessment function that evaluates multiple qualification tiers starting from an initial credit score threshold. The function should calculate the sum of scores across all qualifying tiers, where each subsequent tier reduces the score requirement by 2 points from the initial threshold. The assessment continues creating tiers until the adjusted score requirement would fall below the minimum acceptable level (zero). This tiered approach helps determine the total risk exposure when considering applicants across different credit score bands, with the calculation following the pattern: initial threshold + (threshold-2) + (threshold-4), and so on. The resulting sum represents the cumulative risk tolerance value across all viable lending tiers.
    

    """
def sum_series(n):
    """
    Design a credit risk assessment function that evaluates multiple qualification tiers starting from an initial credit score threshold. The function should calculate the sum of scores across all qualifying tiers, where each subsequent tier reduces the score requirement by 2 points from the initial threshold. The assessment continues creating tiers until the adjusted score requirement would fall below the minimum acceptable level (zero). This tiered approach helps determine the total risk exposure when considering applicants across different credit score bands, with the calculation following the pattern: initial threshold + (threshold-2) + (threshold-4), and so on. The resulting sum represents the cumulative risk tolerance value across all viable lending tiers.
    

    """
    if n < 1:
        return 0
    else:
        return n + sum_series(n - 2)