from machine import Pin 
import time

leds = [Pin(17, Pin.OUT), Pin(18, Pin.OUT), Pin(19, Pin.OUT), Pin(20, Pin.OUT), Pin(21, Pin.OUT)]
swl = Pin(5, Pin.IN, Pin.PULL_UP)
sw2 = Pin(13, Pin.IN, Pin.PULL_UP)
count = 0

while True:
    if not swl.value():  
        if count < len(leds):  
            leds[count].on()  
            count += 1
        time.sleep(0.1)  
    if not sw2.value():  
        if count > 0:  
            count -= 1
            leds[count].off()  
        time.sleep(0.1)  
    time.sleep(0.075)