
    Given the number of concurrent banking transactions being monitored, determine the largest batch size (which must be a power of 2) that can be processed simultaneously without exceeding the total number of transactions, to optimize the fraud detection system's computational efficiency.
    

    
def highest_Power_of_2(n):
    """
    Given the number of concurrent banking transactions being monitored, determine the largest batch size (which must be a power of 2) that can be processed simultaneously without exceeding the total number of transactions, to optimize the fraud detection system's computational efficiency.
    

    """
def highest_Power_of_2(n):
    """
    Given the number of concurrent banking transactions being monitored, determine the largest batch size (which must be a power of 2) that can be processed simultaneously without exceeding the total number of transactions, to optimize the fraud detection system's computational efficiency.
    

    """
    res = 0
    for i in range(n, 0, -1):
        if i & i - 1 == 0:
            res = i
            break
    return res