
    Design a validation function for an automated grading system that checks if a student's numerical answer follows the digit frequency rule, where each digit in the response cannot appear more times than its actual value (e.g., digit 2 cannot appear more than 2 times). This validation helps assess students' understanding of numerical patterns and serves as a prerequisite check before detailed grading of mathematical concepts.
    

    
def validate(n):
    """
    Design a validation function for an automated grading system that checks if a student's numerical answer follows the digit frequency rule, where each digit in the response cannot appear more times than its actual value (e.g., digit 2 cannot appear more than 2 times). This validation helps assess students' understanding of numerical patterns and serves as a prerequisite check before detailed grading of mathematical concepts.
    

    """
def validate(n):
    """
    Design a validation function for an automated grading system that checks if a student's numerical answer follows the digit frequency rule, where each digit in the response cannot appear more times than its actual value (e.g., digit 2 cannot appear more than 2 times). This validation helps assess students' understanding of numerical patterns and serves as a prerequisite check before detailed grading of mathematical concepts.
    

    """
    for i in range(10):
        temp = n
        count = 0
        while temp:
            if temp % 10 == i:
                count += 1
            if count > i:
                return False
            temp //= 10
    return True