void setup() {
  
  pinMode(13, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(11, OUTPUT);
    pinMode(9, OUTPUT);
  pinMode(7, INPUT_PULLUP);

}

void loop() {
  int b = digitalRead(7);

  if(b == LOW){
    digitalWrite(13, HIGH);
 digitalWrite(6, HIGH);
 digitalWrite(11, HIGH);
 digitalWrite(9, HIGH);
  } 
  else{
    digitalWrite(6, LOW);
    digitalWrite(13, LOW);
    digitalWrite(11, LOW);
    digitalWrite(9, LOW);

  }
}