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

void setup() {
pinMode(3, INPUT_PULLUP);
for(int i = 8;i<14;i++){
pinMode(i, OUTPUT);
digitalWrite(i,1);
delay(500);}
delay(1000);
Ledoff();
for(int i = 8; i<14;i++){
digitalWrite(i,0);
}
digitalWrite(8,1);
}

bool presskey = false;
int led = 8;

void loop() {
bool key = !digitalRead(3);
if(key && !presskey){
  presskey = true;
  delay(20);
}
if (!key && presskey){
  presskey = false;
  delay(20);
  Ledoff();
  led = led+1;
  digitalWrite(led,1);
  if (led>12){
    led=7;
  }
}
}