int led_count = 0;
unsigned long timer;
bool ButtonFlag;
bool ButtonIsPressed;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(7, OUTPUT);
  pinMode(8,OUTPUT);
  pinMode(9,OUTPUT);
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(13,INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  ButtonIsPressed = !digitalRead(13); 
  if(ButtonIsPressed && timer < millis()-50&&!ButtonFlag){
    digitalWrite(led_count+7, !digitalRead(led_count+7));
    timer = millis();
    led_count++;
    Serial.print(led_count);Serial.print(" - ");Serial.println(timer);
    ButtonFlag = true;    
  }
  if(!ButtonIsPressed&&timer < millis()-50&&ButtonFlag){
    timer = millis();
    ButtonFlag = false;
  }

  if(led_count==5) led_count=0;
  Serial.println(digitalRead(13));


}