int buttonState = 0;         // variable for reading the pushbutton status
int pb_count = 2;

void setup() {
  pinMode(3, OUTPUT);
  pinMode(2, INPUT);
  Serial.begin (9600);
  
}
void loop() 
  buttonState = digitalRead(2);
  if (buttonState==1)
   {  pb_count = pb_count + 1;
      Serial.println (pb_count);
      }
      if (pb_count%2==1) {
          digitalWrite(3, HIGH);
         
       } else {
             digitalWrite(3, LOW);
             
       }
   delay(250);
}