int LedPin = 6;
int LedPinY = 10;
int redblink = 5;
int yellowblink = 3;
int dt = 500;
int j;
void setup() {
  // put your setup code here, to run once:
pinMode(LedPin, OUTPUT);
pinMode(LedPinY, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
for (j=1;j<=redblink;j=j+1){
  digitalWrite(LedPin, HIGH);
  delay(dt);
  digitalWrite(LedPin, LOW);
  delay(dt);
}
for (j=1;j<=yellowblink;j=j+1){
  digitalWrite(LedPinY, HIGH);
  delay(dt);
  digitalWrite(LedPinY, LOW);
  delay(dt);
}
}