
    Write a function that validates a wearable device's health metric code by ensuring each physiological measurement threshold (represented as a digit) does not appear more times than its actual value in the code. The code is considered valid only if a threshold digit '4' appears no more than 4 times, a threshold digit '3' appears no more than 3 times, and so on throughout the entire health metric code.
    

    
def validate(n):
    """
    Write a function that validates a wearable device's health metric code by ensuring each physiological measurement threshold (represented as a digit) does not appear more times than its actual value in the code. The code is considered valid only if a threshold digit '4' appears no more than 4 times, a threshold digit '3' appears no more than 3 times, and so on throughout the entire health metric code.
    

    """
def validate(n):
    """
    Write a function that validates a wearable device's health metric code by ensuring each physiological measurement threshold (represented as a digit) does not appear more times than its actual value in the code. The code is considered valid only if a threshold digit '4' appears no more than 4 times, a threshold digit '3' appears no more than 3 times, and so on throughout the entire health metric code.
    

    """
    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