const int Radled =15,Greenled = 16;
void setup()
{
pinMode(Radled, OUTPUT);  
pinMode(Greenled, OUTPUT);
digitalWrite(Radled, HIGH);
digitalWrite(Greenled, HIGH);
delay(3000);
digitalWrite(Radled, LOW);
digitalWrite(Greenled, LOW);
delay(1000);
}
void loop()
{
pinMode(Radled, OUTPUT);  
pinMode(Greenled, OUTPUT);
digitalWrite(Radled, HIGH);
digitalWrite(Greenled, HIGH);
delay(1000);
digitalWrite(Radled, LOW);
digitalWrite(Greenled, LOW);
delay(1000);
}