// the setup function runs once when you press reset or power the board
 const int button = 27;//27
 const int led1 = 26;
 const int led2 = 0;
 const int led3 = 1;

 int buttonstock = HIGH;
 int statebutton = HIGH;
 int ledon = 0;
 void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(button, INPUT);
  pinMode(26, OUTPUT);//Led
  pinMode(0, OUTPUT);//Led
  pinMode(1, OUTPUT);//Led
 
  //pinMode(LED_BUILTIN, OUTPUT);
}

// the loop function runs over and over again forever
 void loop() {
  //define the numner of ledd on 
  int statebutton = digitalRead(button);
  if (statebutton == LOW && buttonstock == HIGH) {
    ledon++;
    if (ledon > 3) {
      ledon = 0;
    }
  }
//switch on or off depending of the situation
  switch (ledon) {
    case 0:
      digitalWrite(led1, LOW);
      digitalWrite(led2, LOW);
      digitalWrite(led3, LOW); 
      break;
    case 1:
      digitalWrite(led1, HIGH);
      break;
    case 2:
      digitalWrite(led2, HIGH);
      break;
    case 3:
      digitalWrite(led3, HIGH);
      break;
  }
  buttonstock = statebutton;
}