unsigned long time1;
int j=10;

void setup () {
Serial.begin(9600);
Serial.println("BEGIN");
Serial.println();

pinMode(2, INPUT_PULLUP); // red button
pinMode(7, INPUT_PULLUP); // green button
pinMode(6, OUTPUT); // greed LED
pinMode(3, OUTPUT); // red LED

}

void loop () {

  if (digitalRead(2) == LOW) {
    j=0;
  }

  if (millis() - time1 > 500 && j < 9) {
    digitalWrite(3, !digitalRead(3));
    time1 = millis();
    j++;
  }

  if (digitalRead(7) == LOW) {
    digitalWrite(6, LOW);
  } else {digitalWrite(6, HIGH);}

}