
    Write a function that validates a mobile banking authentication code by ensuring that each digit in the code appears no more times than its own value, which serves as a security measure against fraudulent transactions. For example, in a valid code, the digit 3 should not appear more than 3 times, and the digit 1 should not appear more than once.
    

    
def validate(n):
    """
    Write a function that validates a mobile banking authentication code by ensuring that each digit in the code appears no more times than its own value, which serves as a security measure against fraudulent transactions. For example, in a valid code, the digit 3 should not appear more than 3 times, and the digit 1 should not appear more than once.
    

    """
def validate(n):
    """
    Write a function that validates a mobile banking authentication code by ensuring that each digit in the code appears no more times than its own value, which serves as a security measure against fraudulent transactions. For example, in a valid code, the digit 3 should not appear more than 3 times, and the digit 1 should not appear more than once.
    

    """
    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