int x =2;

void setup() {
  Serial.begin(115200);

  pinMode(2, OUTPUT); 
  pinMode(3, OUTPUT); 
  pinMode(4, OUTPUT); 
  pinMode(5, OUTPUT); 
  pinMode(6, OUTPUT); 
  pinMode(8, INPUT_PULLUP); 

}

void loop() {

  ledPin(x);
  x = x + 1;
  if (x==6){
      x=2;
    }
  }

void ledPin(int pin) {

  digitalWrite(pin, HIGH);
  delay(200);
  digitalWrite(pin, LOW);
  delay(200);

}