import time
from machine import Pin

time.sleep(0.1) # wait for USB to become ready

print("hello, Pi pico!")

btn = Pin(0, Pin.IN, Pin.PULL_UP)
led = Pin(25,Pin.OUT)
led2 = Pin(26,Pin.OUT)
led3 = Pin(27,Pin.OUT)
led4 = Pin(28,Pin.OUT)

while True:
    if btn.value() ==0:
        led.value(1)
        time.sleep(0.5)
        led2.value(1)
        time.sleep(0.5)
        led3.value(1)
        time.sleep(0.5)
        led4.value(1)
        time.sleep(0.5)
        led.value(0)
        time.sleep(0.5)
        led2.value(0)
        time.sleep(0.5)
        led3.value(0)
        time.sleep(0.5)
        led4.value(0)
    else:
        led.value(0)
        led2.value(0)
        led3.value(0)
        led4.value(0)