const int led[3] = {13,12,11};
const int btn = A4;
bool statuspb=LOW;
int x=0;

void setup() {
  for(int i=0; i<3; i++){
    pinMode(led[i], OUTPUT);
  }
  pinMode(btn,INPUT);

}

void loop() {
  statuspb = digitalRead(btn);
  
  if(statuspb == LOW){
    x++;
    delay(200);
  }
   
    switch(x) {
      case 1 :
        digitalWrite(led[0], HIGH);
        delay(1000);
        digitalWrite(led[0], LOW);
        delay(1000);
        digitalWrite(led[1], HIGH);
        delay(1000);
        digitalWrite(led[1], LOW);
        delay(1000);
        digitalWrite(led[2], HIGH);
        delay(1000);
        digitalWrite(led[2], LOW);
        delay(1000);
        break;
      case 2 :
        digitalWrite(led[0], HIGH);
        delay(500);
        digitalWrite(led[0], LOW);
        delay(500);
        digitalWrite(led[1], HIGH);
        delay(500);
        digitalWrite(led[1], LOW);
        delay(500);
        digitalWrite(led[2], HIGH);
        delay(500);
        digitalWrite(led[2], LOW);
        delay(500);
        break;
      case 3 : 
        digitalWrite(led[0], HIGH);
        delay(100);
        digitalWrite(led[0], LOW);
        delay(100);
        digitalWrite(led[1], HIGH);
        delay(100);
        digitalWrite(led[1], LOW);
        delay(100);
        digitalWrite(led[2], HIGH);
        delay(100);
        digitalWrite(led[2], LOW);
        delay(100);
        break;
      case 4 :
        digitalWrite(led[0], HIGH);
        digitalWrite(led[1], HIGH);
        digitalWrite(led[2], HIGH);
        delay(1000);
        digitalWrite(led[0], LOW);
        digitalWrite(led[1], LOW);
        digitalWrite(led[2], LOW);
        delay(1000);
        break;
    
      default:
        if (x>=5) {
          x=0;
        }
        break;
    }
}