int led1 = 4;//se declara la variable
int led2 = 15;//se declara la variable
int led3 = 17;//se declara la variable


void setup(){
pinMode(led1,OUTPUT);

pinMode(led2,OUTPUT);

pinMode(led3,OUTPUT);
}

void loop() {
digitalWrite(led1,HIGH);
delay (100);
digitalWrite(led1,LOW);
delay(100);


digitalWrite(led2,HIGH);
delay (100);
digitalWrite(led2,LOW);
delay(100);


digitalWrite(led3,HIGH);
delay (100);
digitalWrite(led3,LOW);
delay(100);

}