bool sw1 = 0;
bool sw2 = 0;
bool sw3 = 0;
bool k_red = 0;
bool k_yellow = 0;
void setup(){
  pinMode(25, INPUT); //SW1
  pinMode(26, INPUT); //SW2
  pinMode(27, INPUT); //SW3
  pinMode(16, OUTPUT); //RED
  pinMode(17, OUTPUT); //YELLOW
  pinMode(18, OUTPUT); //GREEN
}

void loop(){
  sw1 = digitalRead(25);
  sw2 = digitalRead(26);
  sw3 = digitalRead(27);

  if(sw1 == 1){
    k_red = 1;
  }
  if(sw2 == 1){
    k_yellow = 1;
  }

  if(k_red == 1){
    digitalWrite(16, 1);
  }

  if(k_yellow == 1){
    digitalWrite(18, 1);
  }

  if(sw3 == 1){
    k_red = 0;
    k_yellow = 0;
    digitalWrite(16, 0);
    digitalWrite(18, 0);
    digitalWrite(17, 1);
    delay(300);
    digitalWrite(17, 0);
  }
}