#define led 13
#define led2 12
#define led3 11

void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(led, true);
delay (1000);
digitalWrite(led, false);
delay (1000);

digitalWrite(led2, true);
delay (1000);
digitalWrite(led2, false);
delay (1000);

digitalWrite(led3, true);
delay (1000);
digitalWrite(led3, false);
delay (1000);
}