#define butRed 2
#define butGreen 4

#define led_red 13
#define led_yellow 12
#define led_green 11
#define led_blue 10

int status = 0;

void setup() {
  pinMode(led_red, OUTPUT);
  pinMode(led_yellow, OUTPUT);
  pinMode(led_green, OUTPUT);
  pinMode(led_blue, OUTPUT);

  digitalWrite(led_red, LOW);
  digitalWrite(led_yellow, LOW);
  digitalWrite(led_green, LOW);
  digitalWrite(led_blue, LOW);
  delay(1000);
}

void loop() {
  switch (status) {
    case 0:
      digitalWrite(led_red, HIGH);
      delay(500);
      digitalWrite(led_red, LOW);
      status++;
      break;

    case 1:
      digitalWrite(led_yellow, HIGH);
      delay(500);
      digitalWrite(led_yellow, LOW);
      status++;
      break;

    case 2:
      digitalWrite(led_green, HIGH);
      delay(500);
      digitalWrite(led_green, LOW);
      status++;
      break;

    case 3:
      digitalWrite(led_blue, HIGH);
      delay(500);
      digitalWrite(led_blue, LOW);
      status++;
      break;

    case 4:
      if (digitalRead(butRed) == HIGH) {
        for (int i = 0; i < 4; i++) {
          digitalWrite(led_red, HIGH);
          digitalWrite(led_yellow, HIGH);
          digitalWrite(led_green, LOW);
          digitalWrite(led_blue, LOW);
          delay(500);

          digitalWrite(led_red, LOW);
          digitalWrite(led_yellow, LOW);
          digitalWrite(led_green, HIGH);
          digitalWrite(led_blue, HIGH);
          delay(500);
        }
      } else if (digitalRead(butGreen) == HIGH) {
        for (int i = 0; i < 4; i++) {
          digitalWrite(led_red, HIGH);
          digitalWrite(led_yellow, LOW);
          digitalWrite(led_green, HIGH);
          digitalWrite(led_blue, LOW);
          delay(500);

          digitalWrite(led_red, LOW);
          digitalWrite(led_yellow, HIGH);
          digitalWrite(led_green, LOW);
          digitalWrite(led_blue, HIGH);
          delay(500);
        }
      }
      status = 0;
      break;
  }
}