Working with RGB LED

const int RED = 11;
const int GREEN = 10;
const int BLUE = 9;

void setup() {
  pinMode (RED, OUTPUT);
  pinMode (GREEN, OUTPUT);
  pinMode (BLUE, OUTPUT);
}

void loop() {
  analogWrite (RED, 255);
  analogWrite (GREEN, 0);
  analogWrite (BLUE, 0);
  delay (1000);
  analogWrite (RED, 0);
  analogWrite (GREEN, 255);
  analogWrite (BLUE, 0);
  delay (1000);
  analogWrite (RED, 0);
  analogWrite (GREEN, 0);
  analogWrite (BLUE, 255);
  delay (1000);
}