void setup() {
  // put your setup code here, to run once:
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
  int R=random(255),G=random(255),B=random(255);
  analogWrite(11, R);
  analogWrite(12, G);
  analogWrite(13, B);
  delay(100);
}