const int RED_LED= 11;
const int YELLOW_LED= 12;
const int GREEN_LED= 13;

void setup() {
pinMode(RED_LED,OUTPUT);
pinMode(YELLOW_LED, OUTPUT);
pinMode(GREEN_LED, OUTPUT);
}

void loop() {
digitalWrite(RED_LED, HIGH);
digitalWrite(YELLOW_LED, HIGH);
digitalWrite(GREEN_LED, HIGH);
}