const int led1 = 3;
const int led2 = 4;
const int led3 = 5;
int buttonA = 7;
int buttonB = 8;
int buttonC = 9;


void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(buttonA, INPUT);
  pinMode(buttonB, INPUT);
  pinMode(buttonC, INPUT);
}

void loop() {
  int tombolA = digitalRead(buttonA);
  int tombolB = digitalRead(buttonB);
  int tombolC = digitalRead(buttonC);
  
  if (tombolA == HIGH){
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
  }else if (tombolB == HIGH){
    digitalWrite(led1, HIGH);
    digitalWrite(led3, HIGH);
  } else if (tombolC == HIGH){
    digitalWrite(led3, HIGH);
  }else{
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
}