int pauza = 500;
const int buttonPin = A0;
const int ledPin = 13;
int buttonState = 0;
void setup() {
for ( int i=2; i<8;i++)
  {
    pinMode(i, OUTPUT);
    pinMode(buttonPin, INPUT);
    pinMode(ledPin, INPUT);
  }
}
void loop() {
for (int i=2; i<8;i++)
  {
  digitalWrite(i,HIGH);
  delay(pauza);
  digitalWrite(i, LOW);
  delay(pauza);
  }
{buttonState = digitalRead(buttonPin);
  if (buttonState == HIGH)
  digitalWrite(ledPin, HIGH);}

  }