void setup() {
  pinMode(1,OUTPUT);//RED
  pinMode(4,OUTPUT);//GREEN
  pinMode(7,OUTPUT);//BLUE
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(1,HIGH);
  digitalWrite(4,LOW);
  digitalWrite(7,LOW);
  delay(20000);
  digitalWrite(1,LOW);
  digitalWrite(4,HIGH);
  delay(10000);
  digitalWrite(4,LOW);
  digitalWrite(7,HIGH);
  delay(5000); // this speeds up the simulation
}