
    Calculate the total length of safety barriers needed for a pentagon-shaped bus terminal where passengers board from all sides, given the length of each side of the terminal. The terminal has equal sides and requires continuous barrier installation along its entire perimeter for passenger safety.
    

    
import math

def perimeter_pentagon(a):
    """
    Calculate the total length of safety barriers needed for a pentagon-shaped bus terminal where passengers board from all sides, given the length of each side of the terminal. The terminal has equal sides and requires continuous barrier installation along its entire perimeter for passenger safety.
    

    """
import math

def perimeter_pentagon(a):
    """
    Calculate the total length of safety barriers needed for a pentagon-shaped bus terminal where passengers board from all sides, given the length of each side of the terminal. The terminal has equal sides and requires continuous barrier installation along its entire perimeter for passenger safety.
    

    """
    perimeter = 5 * a
    return perimeter