const int LED_PIN = 4;
const int BUTTON_PIN = 5;
int mode = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(digitalRead(BUTTON_PIN) == HIGH){
    if(mode == 0){
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      delay(125);
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      mode++;
      delay(100);
    }
    else if(mode == 1){
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      delay(125);
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      delay(125);
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      mode++;
      delay(100);
    }
    else if(mode == 2){
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      delay(125);
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      mode++;
      delay(100);
    }
    else if(mode == 3){
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      delay(125);
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      mode++;
      delay(100);
    }
    else if(mode == 4){
      digitalWrite(LED_PIN, HIGH);
      delay(125);
      digitalWrite(LED_PIN, LOW);
      mode = 0;
      delay(100);
    }
  }
}