
    In a hospital's medication safety system, develop a function that evaluates the potential drug interaction risk for patients with multiple prescriptions. Given a patient with n active medications, the system needs to assess interaction patterns by analyzing decreasing pairs of concurrent medications, starting from all n medications and reducing by 2 medications at each step until no medications remain in the analysis group. The risk assessment value is calculated as the sum of each step's remaining medication count (n + (n-2) + (n-4)... continuing until the remaining count becomes zero or negative). This calculation helps healthcare providers quickly identify patients who may require additional medication interaction reviews based on their prescription complexity.
    

    
def sum_series(n):
    """
    In a hospital's medication safety system, develop a function that evaluates the potential drug interaction risk for patients with multiple prescriptions. Given a patient with n active medications, the system needs to assess interaction patterns by analyzing decreasing pairs of concurrent medications, starting from all n medications and reducing by 2 medications at each step until no medications remain in the analysis group. The risk assessment value is calculated as the sum of each step's remaining medication count (n + (n-2) + (n-4)... continuing until the remaining count becomes zero or negative). This calculation helps healthcare providers quickly identify patients who may require additional medication interaction reviews based on their prescription complexity.
    

    """
def sum_series(n):
    """
    In a hospital's medication safety system, develop a function that evaluates the potential drug interaction risk for patients with multiple prescriptions. Given a patient with n active medications, the system needs to assess interaction patterns by analyzing decreasing pairs of concurrent medications, starting from all n medications and reducing by 2 medications at each step until no medications remain in the analysis group. The risk assessment value is calculated as the sum of each step's remaining medication count (n + (n-2) + (n-4)... continuing until the remaining count becomes zero or negative). This calculation helps healthcare providers quickly identify patients who may require additional medication interaction reviews based on their prescription complexity.
    

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