int LEDred1 = 8;
int LEDred2 = 9;
int LEDred3 = 10;

void setup() {
  // put your setup code here, to run once:
pinMode(LEDred1,OUTPUT);
pinMode(LEDred2,OUTPUT);
pinMode(LEDred3,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(LEDred1,HIGH);
delay(500);
digitalWrite(LEDred1,LOW);
delay(500);
digitalWrite(LEDred2,HIGH);
delay(500);
digitalWrite(LEDred2,LOW);
delay(500);
digitalWrite(LEDred3,HIGH);
delay(500);
digitalWrite(LEDred3,LOW);
delay(500);
}