int LedR=7;
int LedY=6;
int LedG=5;

void setup() {
  // put your setup code here, to run once:
pinMode(LedR, OUTPUT);
pinMode(LedY, OUTPUT);
pinMode(LedG, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(LedR, HIGH);
delay(6000);
digitalWrite(LedR, LOW);
delay(0);
digitalWrite(LedY, HIGH);
delay(2000);
digitalWrite(LedY, LOW);
delay(0);
digitalWrite(LedG, HIGH);
delay(4000);
digitalWrite(LedG, LOW);
delay(0);
digitalWrite(LedY, HIGH);
delay(2000);
digitalWrite(LedY, LOW);
delay(0);

}