
    In a personalized learning system, determine the achievement threshold for a student at progression level n, where each threshold is calculated based on the sum of thresholds at positions corresponding to the previous two achievement levels. The system follows a pattern where each new threshold builds upon earlier milestones, starting with initial values of 1,1, and each subsequent value is determined by the sum of values at positions indicated by the previous number in the sequence.
    

    
def sequence(n):
    """
    In a personalized learning system, determine the achievement threshold for a student at progression level n, where each threshold is calculated based on the sum of thresholds at positions corresponding to the previous two achievement levels. The system follows a pattern where each new threshold builds upon earlier milestones, starting with initial values of 1,1, and each subsequent value is determined by the sum of values at positions indicated by the previous number in the sequence.
    

    """
def sequence(n):
    """
    In a personalized learning system, determine the achievement threshold for a student at progression level n, where each threshold is calculated based on the sum of thresholds at positions corresponding to the previous two achievement levels. The system follows a pattern where each new threshold builds upon earlier milestones, starting with initial values of 1,1, and each subsequent value is determined by the sum of values at positions indicated by the previous number in the sequence.
    

    """
    if n == 1 or n == 2:
        return 1
    else:
        return sequence(sequence(n - 1)) + sequence(n - sequence(n - 1))