
    Design a function for the bank's fraud detection system that activates all primary security verification checks (represented by even-positioned bits) in a transaction pattern, regardless of their current state. The function should take a binary transaction pattern as input, where each bit represents a specific security check flag, and ensure all even-positioned bits are set to 1 while preserving odd-positioned flags.
    

    
def even_bit_set_number(n):
    """
    Design a function for the bank's fraud detection system that activates all primary security verification checks (represented by even-positioned bits) in a transaction pattern, regardless of their current state. The function should take a binary transaction pattern as input, where each bit represents a specific security check flag, and ensure all even-positioned bits are set to 1 while preserving odd-positioned flags.
    

    """
def even_bit_set_number(n):
    """
    Design a function for the bank's fraud detection system that activates all primary security verification checks (represented by even-positioned bits) in a transaction pattern, regardless of their current state. The function should take a binary transaction pattern as input, where each bit represents a specific security check flag, and ensure all even-positioned bits are set to 1 while preserving odd-positioned flags.
    

    """
    count = 0
    res = 0
    temp = n
    while temp > 0:
        if count % 2 == 1:
            res |= 1 << count
        count += 1
        temp >>= 1
    return n | res