char val;
int ledPin = 13;
int buttonPin2 = 2;
int buttonPin3 = 3;
int buttonPin4 = 4;
int buttonPin5 = 5;
int State2 = 0;
int State3 = 0;
int State4 = 0;
int State5 = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  pinMode(buttonPin4, INPUT);
  pinMode(buttonPin5, INPUT);

}

void loop(){
//Check the state of each button:
State2 = digitalRead(buttonPin2);
State3 = digitalRead(buttonPin3);
State4 = digitalRead(buttonPin4);
State5 = digitalRead(buttonPin5);

//Verify if the buttons are pressed:
  
  if (State2 == HIGH) {
    Serial.print("2.");
    delay(250);
  }
  else if (State3 == HIGH) {
    Serial.print("3.");
    delay(250);
  }
  else if (State4 == HIGH) {
    Serial.print("4.");
    delay(250);
  }
  else if (State5 == HIGH) {
    Serial.print("5.");
    delay(250);
  }
  else {
    Serial.print("0.");
    delay(250);
  }
 // Serial.println();
}