
    Calculate the total distance a bus must travel to complete a square route around a district by circling four equal-length city blocks. Given the length of one city block in kilometers, determine the complete route distance to help optimize fuel consumption planning.
    

    
def square_perimeter(a):
    """
    Calculate the total distance a bus must travel to complete a square route around a district by circling four equal-length city blocks. Given the length of one city block in kilometers, determine the complete route distance to help optimize fuel consumption planning.
    

    """
def square_perimeter(a):
    """
    Calculate the total distance a bus must travel to complete a square route around a district by circling four equal-length city blocks. Given the length of one city block in kilometers, determine the complete route distance to help optimize fuel consumption planning.
    

    """
    perimeter = 4 * a
    return perimeter