int Red = 3;
int yellow = 4;
int green = 5;
int x = 1;
void setup() {
  pinMode(Red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);

}


void loop() {

  if (x == 0) {
    digitalWrite(Red, HIGH);
    delay(4000);
    digitalWrite(Red, LOW);
    digitalWrite(green, HIGH);
    delay(3000);
    digitalWrite(green, LOW);
    digitalWrite(yellow, HIGH);
    delay(2000);
    digitalWrite(yellow, LOW);
    
  }
    else{

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

}