int Red =7;
int Green =6;
int Blue =5;

void setup() {
  // put your setup code here, to run once:
pinMode(7, OUTPUT);
pinMode(6, OUTPUT);
pinMode(5, OUTPUT);
pinMode(8, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(Red, HIGH);tone(8,1000,100);
digitalWrite(Green, LOW);
digitalWrite(Blue, LOW);
delay(1000);
digitalWrite(Red, LOW);tone(8,1000,100);
digitalWrite(Green, HIGH);
digitalWrite(Blue, LOW);
delay(1000);
digitalWrite(Red, LOW);tone(8,1000,100);
digitalWrite(Green, LOW);
digitalWrite(Blue, HIGH);
delay(1000);
}