// VARIABLE

int tiempo = 300;
int j; 

void setup() {
  // put your setup code here, to run once:

pinMode(13, OUTPUT);
pinMode(7, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

for(j=1; j<= 4; j=j+1){

digitalWrite(13, HIGH);
delay(tiempo);
digitalWrite(13, LOW);
delay(tiempo);
}

for(j=1; j<= 3; j=j+1){
digitalWrite(7, HIGH);
delay(tiempo);
digitalWrite(7, LOW);
delay(tiempo);
}

}