const int ledRed=17;
const int ledBlue=4;
const int ledGreen=5;
void setup() {
  // put your setup code here, to run once:
 pinMode(ledRed, OUTPUT);
 pinMode(ledBlue, OUTPUT);
 pinMode(ledGreen, OUTPUT);

}

void loop() {
digitalWrite(ledRed, HIGH);
digitalWrite(ledBlue, LOW);
digitalWrite(ledGreen, LOW);
delay(1000);
digitalWrite(ledRed, LOW);
digitalWrite(ledBlue, HIGH);
digitalWrite(ledGreen, LOW);
delay(1000);
digitalWrite(ledRed, LOW);
digitalWrite(ledBlue, LOW);
digitalWrite(ledGreen, HIGH);
delay(1000);
digitalWrite(ledRed, LOW);
digitalWrite(ledBlue, LOW);
digitalWrite(ledGreen, LOW);
delay(1000);
}