// C++ code
int LED1=13;
int LED2=12;
int LED3=8;
int LED4=7;

void setup()
{ 
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(LED4, OUTPUT);
    
}

void loop()
{
digitalWrite(13,HIGH);
digitalWrite(12,LOW);
  digitalWrite(8,LOW);
  digitalWrite(7,LOW);
  delay(100);
 digitalWrite(13,LOW);
digitalWrite(12,HIGH);
  digitalWrite(8,LOW);
  digitalWrite(7,LOW);
  delay(100);
  digitalWrite(13,LOW);
digitalWrite(12,LOW);
  digitalWrite(8,HIGH);
  digitalWrite(7,LOW);
  delay(100);
   digitalWrite(13,LOW);
digitalWrite(12,LOW);
  digitalWrite(8,HIGH);
  digitalWrite(7,LOW);
  delay(100);
   digitalWrite(13,LOW);
digitalWrite(12,LOW);
  digitalWrite(8,LOW);
  digitalWrite(7,HIGH);
  delay(100);
}