const int btn1 = 25;
const int btn2 = 26;
const int btn3 = 27;

const int led1 = 23;
const int led2 = 22;
const int led3 = 21;
const int led4 = 19;

void setup ()
{
  Serial.begin(9600);
  pinMode(btn1,INPUT);
  pinMode(btn2, INPUT);
  pinMode(btn3, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
}

void loop()
{
  int estado_btn1 = digitalRead(btn1);
  int estado_btn2 = digitalRead(btn2);
  int estado_btn3 = digitalRead(btn3);

  if(estado_btn3 == HIGH)
  {
    digitalWrite(led1, HIGH);
    delay(1000);
    digitalWrite(led2, HIGH);
    delay(1000);
     digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    delay(2000);
  }
  else if(estado_btn2 == HIGH)
  {
    digitalWrite(led3, HIGH);
    delay(1000);
    digitalWrite(led3, LOW);
    delay(2000);
  }
  else if (estado_btn1 == HIGH)
  {
    digitalWrite(led1,HIGH);
    delay(1000);
    digitalWrite(led4, HIGH);
    delay(1000);
     digitalWrite(led1, LOW);
    digitalWrite(led4, LOW);
    delay(2000);
  }
   else 
  {
   digitalWrite(led1, LOW); 
   digitalWrite(led2, LOW); 
   digitalWrite(led3, LOW);
   digitalWrite(led4, LOW); 
  }
  delay(200);
}