const int buttonPin = 2;  // the number of the pushbutton pin
// variables will change:
int buttonState = 0;  // variable for reading the pushbutton status
int counter;
int x=0;
int buttonCount=0;

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    delay(10);
  }
  // initialize the pushbutton pin as an input:
  pinMode(buttonPin, INPUT_PULLUP);
  // put your setup code here, to run once:
  
}

void loop() {
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonPin);
  // put your main code here, to run repeatedly:
      if (buttonState == LOW && buttonCount==0) {
        x=counter;
        counter = value(x);
        buttonCount=1;
        delay(200);
      }else if(buttonState == HIGH){
           buttonCount=0;
      }
}

int value(int x){
  ++x;
  Serial.print(x);
  if (x>=3){
    x=0;
  }
  return x;
}