#define led 11  
#define led2 7
#define led3 4
#define push A0

void setup() {
 pinMode(led, OUTPUT);
 pinMode(led2, OUTPUT);
 pinMode(led3, OUTPUT);

 pinMode(push,INPUT_PULLUP);
 //pinMode(push, INPUT_PULLDOWN); no existe
 //pinMode(push, INPUT);

}

void loop() {
  
if(digitalRead(push)==LOW) {
for(int i= 0; i<3; i++) {
digitalWrite(led, HIGH);
delay(200);
digitalWrite(led, LOW);
delay(200);}

for(int i= 0; i<3; i++) {
digitalWrite(led2, HIGH);
delay(200);
digitalWrite(led2, LOW);
delay(200);}

for (int i= 0; i<3; i++) {
digitalWrite(led3, HIGH);
delay(200);
digitalWrite(led3, LOW);
delay(200);}

}

}