void led_off(){
  for (int i = 8; i<14; i++){
  digitalWrite(i,0);
}
}

void setup() {
  pinMode(3, INPUT_PULLUP);

  for (int i = 8; i<14; i++){
    pinMode(i, OUTPUT);
    digitalWrite(i, 1);
    delay(500);
  }
  delay(1000);
  led_off();
  digitalWrite(8, 1);
}

int pin_led = 8;
bool press_key = false;
void loop() {
  // put your main code here, to run repeatedly:
bool key = !digitalRead(3);
delay(20);
if (key && !press_key){
  press_key = true;
  
}

if (!key && press_key){
  press_key = false;
  pin_led = pin_led + 1;
  led_off ();
  if (pin_led > 13){
    pin_led = 8;
  }
}
digitalWrite(pin_led, 1);
}