import time
from machine import Pin 

pin1 = Pin(5,Pin.OUT)
pin3 = Pin(4,Pin.OUT)
pin4 = Pin(18,Pin.OUT)

print("Hello, pleum-13")

for i in range(10): 
    print(i+1)
    pin1.on()
    time.sleep(0.5)
    print("LED ON")
    pin1.off()
    time.sleep(0.5)
    print("LED OFF")
    pin3.on()
    time.sleep(0.5)
    print("LED ON")
    pin3.off()
    time.sleep(0.5)
    print("LED OFF")
    pin4.on()
    time.sleep(0.5)
    print("LED ON")
    pin4.off()
    time.sleep(0.5)
    print("LED OFF")