int brightness;
int swithchstat;
int led;  
void setup()
{
  pinMode(13, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(A0, INPUT);
  pinMode(2, INPUT);
  
}

void loop()
{ swithchstat= digitalRead(2);
  brightness = analogRead (A0);
  if (swithchstat == HIGH ){
  analogWrite (9 ,brightness ); 
  analogWrite (10 , 0);
  analogWrite (11 , 0);

  }
  else  {
    analogWrite (9 , 0); 
  analogWrite (10 , brightness);
  analogWrite (11 , 0);
}
}