int pula = 11;
int berde = 10;
int asul = 9;
void setup() {
  // put your setup code here, to run once:
pinMode( pula , OUTPUT);
pinMode( berde , OUTPUT);
pinMode( asul , OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite( pula , HIGH);
digitalWrite( berde , LOW);
digitalWrite( asul , LOW);
delay(500);
digitalWrite( pula , LOW);
digitalWrite( berde , HIGH);
digitalWrite( asul , LOW);
delay(500);
digitalWrite( pula , LOW);
digitalWrite( berde , LOW);
digitalWrite( asul , HIGH );
delay(500);
digitalWrite( pula , HIGH);
digitalWrite( berde , LOW);
digitalWrite( asul , HIGH );
delay(500);
digitalWrite( pula , LOW);
digitalWrite( berde , HIGH);
digitalWrite( asul , HIGH);
delay(500);
digitalWrite( pula , HIGH);
digitalWrite( berde , HIGH);
digitalWrite( asul , LOW );
delay(500);
digitalWrite( pula , HIGH);
digitalWrite( berde , HIGH);
digitalWrite( asul , HIGH );
delay(500);
}