from machine import*
from time import*
ledr=Pin(17,Pin.OUT)
ledor=Pin(19,Pin.OUT)
ledg=Pin(15,Pin.OUT)
while True:
   for i in range(5):
         ledr.on()
         ledor.off()
         ledg.off()
         sleep(3)
         ledr.off()
         ledor.on()
         ledg.off()
         sleep(3)
         ledr.on()
         ledor.off()
         ledg.on()
         sleep(3)