const int r=23,g=21,y=22;
int t=0;
void setup() {
  // put your setup code here, to run once:
  pinMode(r,OUTPUT);
  pinMode(y,OUTPUT);
  pinMode(g,OUTPUT);
  Serial.begin(115200);
}

void loop() {
  t=millis()/1000;
  t=t%16;
  Serial.println(millis());
  if(t<=10)
  {
  digitalWrite(r,HIGH);
  delay(200);
  digitalWrite(r,LOW);
  digitalWrite(y,HIGH);
  delay(200);
  digitalWrite(y,LOW);
  digitalWrite(g,HIGH);
  delay(200);
  digitalWrite(g,LOW);
  }
  else
  {
  digitalWrite(y,HIGH);
  delay(200);
  digitalWrite(y,LOW);
  delay(200);
  }
}