const int buttonPin1 = 2; 
const int buttonPin2 = 3; 
const int buttonPin3 = 4;
const int greenLedPin = 7;
const int redLedPin = 8;

int number;
void setup() {
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  
  randomSeed(analogRead(0)); 
  number = random(1, 4); 
}

void loop() {
  if (digitalRead(buttonPin1) && number == 1) {
    digitalWrite(greenLedPin, HIGH);  
  } else if (digitalRead(buttonPin2) && number == 2) {
    digitalWrite(greenLedPin, HIGH); 
  } else if (digitalRead(buttonPin3) && number == 3) {
    digitalWrite(greenLedPin, HIGH);  
  } else {
    digitalWrite(redLedPin, HIGH);  
  }
}