import time
from machine import Pin
led_pins = [0,1,2,3,4]
leds = [Pin(p, Pin.OUT) for p in led_pins]
period = int(input("Bouncing period (ms): "))
while True:
    for led in leds:
        led.value(1)
        time.sleep_ms(period)
        led.value(0)
    for led in leds[-2:0:-1]:
        led.value(1)
        time.sleep_ms(period)
        led.value(0)