void setup() {
  pinMode(2, INPUT);
  pinMode(3, INPUT);
  pinMode(4, INPUT);
  pinMode(9, OUTPUT); // ko'k
  pinMode(10, OUTPUT); // yashil
  pinMode(11, OUTPUT); // qizil
}

void loop() {
  bool k1 = digitalRead(4);
  bool k2 = digitalRead(3);
  bool k3 = digitalRead(2);

  if(k1 == 1) {
    analogWrite(9, 0);
    analogWrite(10, 0);
    analogWrite(11, 255);
  }
  if(k2 == 1){
    analogWrite(9, 0);
    analogWrite(10, 255);
    analogWrite(11, 0);
  }
  if(k3 == 1){
    analogWrite(9, 255);
    analogWrite(10, 0);
    analogWrite(11, 0);
  }
  if(k1 == 1 && k2 == 1){
    analogWrite(9, 0);
    analogWrite(10, 255);
    analogWrite(11, 255);
  }
}