import RPi.GPIO as gpio
import time
import random

gpio.setmode(gpio.BOARD)
basenum = 50
basenum += randint(1, 5)
pins = [26, 18, 16]
for i in pins:
    gpio.setup(i, gpio.OUT)
for i in range(1, basenum):
    gpio.output(pins[i%3], gpio.HIGH)
    time.sleep(i * 0.03)
    if n != basenum - 1:
        gpio.output(pins[1%3], gpio.LOW)
time.sleep(5)
gpio.cleanup()