//pin to for the Red LED
//pin to for the Yellow LED
//pin to for the Green LED
int short_delay;

void setup() {
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 short_delay = 400;
}

void loop() {
  //Green LED on for 3 seconds
 digitalWrite(4, HIGH);
 delay(3000);
 digitalWrite(4, LOW);

 //Blink Yellow LED three times with interval of 0.300 seconds
 digitalWrite(3, HIGH);
 delay(short_delay);
 digitalWrite(3, LOW);
 delay(short_delay);
 digitalWrite(3, HIGH);
 delay(short_delay);
 digitalWrite(3, LOW);
 delay(short_delay);
 digitalWrite(3, HIGH);
 delay(short_delay);
 digitalWrite(3, LOW);
 delay(short_delay);

 //Red LED on for 3 seconds
 digitalWrite(2, HIGH);
 delay(3000);
 digitalWrite(2, LOW);
}