Paint'nPain Arduino Leonardo Buzzer

#include "Keyboard.h"
const int Button_3 = 2;
const int Button_4 = 9;

int buttonState_3 = 0;
int lastbuttonState_3 = 0;

int buttonState_4 = 0;
int lastbuttonState_4 = 0;


void setup(){

  pinMode(Button_3, INPUT_PULLUP);
  pinMode(Button_4, INPUT_PULLUP);


}

void loop(){


  buttonState_3 = digitalRead(Button_3);

  if(buttonState_3 == HIGH){
    Serial.print("3");
    //Keyboard.print("W");
    lastbuttonState_3 = buttonState_3;
  }


  buttonState_4 = digitalRead(Button_4);

  if(buttonState_4 == HIGH){
    Serial.print("4");
    //Keyboard.print("A");
    lastbuttonState_4 = buttonState_4;
  }
}