int val = 8;
int stop = 13;

void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(9, OUTPUT);
  attachInterrupt(digitalPinToInterrupt(2),reset,HIGH);
}

void loop() {
  int a=analogRead(A0);
  digitalWrite(val, LOW);
  val ++;
  digitalWrite(val, HIGH);
  delay(a*2+100);
  if (val >= stop) {
    val=8;
    stop --;
    }
}
void reset() {
  val=8;
  stop=13;
  digitalWrite(13, LOW);
  digitalWrite(12, LOW);
  digitalWrite(11,LOW);
  digitalWrite(10,LOW);
  digitalWrite(9,LOW);
}