int Red = 10;
int Green = 9;
int Orange = 8;
void setup() {
  // put your setup code here, to run once:
  pinMode(Red, OUTPUT);
  pinMode(Green, OUTPUT);
  pinMode(Orange, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(Red,HIGH);
  delay(3000);
  digitalWrite(Red,LOW);

  digitalWrite(Green,HIGH);
  delay(2000);
  digitalWrite(Green,LOW);

  digitalWrite(Orange,HIGH);
  delay(1000);
  digitalWrite(Orange,LOW);
}