void setup() {
  // put your setup code here, to run once:
pinMode(A0, INPUT);
pinMode(13, OUTPUT);
pinMode(12, OUTPUT);
pinMode(11, OUTPUT);
}

void loop() {
 int b=digitalRead(A0);
 int c=0;
 if(b==0||b==1)
{
  c+=1;
}
if(c==1)
{
  digitalWrite(13, HIGH);
} else if (c==2) 
{  
  digitalWrite(12, HIGH);
}
else
{
    digitalWrite(11, HIGH);
}

}