
    Write a function that determines if a medication code identifier follows a specific safety pattern where its value is one less than twice its reverse, which helps identify potentially dangerous drug combinations in the hospital's medication management system. The function should take a single medication code as input and return a boolean indicating whether this safety pattern is present.
    

    
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function that determines if a medication code identifier follows a specific safety pattern where its value is one less than twice its reverse, which helps identify potentially dangerous drug combinations in the hospital's medication management system. The function should take a single medication code as input and return a boolean indicating whether this safety pattern is present.
    

    """
def rev(num):
    rev_num = 0
    while num > 0:
        rev_num = rev_num * 10 + num % 10
        num = num // 10
    return rev_num

def check(n):
    """
    Write a function that determines if a medication code identifier follows a specific safety pattern where its value is one less than twice its reverse, which helps identify potentially dangerous drug combinations in the hospital's medication management system. The function should take a single medication code as input and return a boolean indicating whether this safety pattern is present.
    

    """
    return 2 * rev(n) == n + 1