Digital Counter using Arduino UNO

//Digital Counter 
//by Manish Kumar

void setup() {
  pinMode(13,OUTPUT); //pin configuration
  pinMode(12,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(10,OUTPUT);

}

void loop() {
  digitalWrite(13,0);//0
  digitalWrite(12,0);
  digitalWrite(11,0);
  digitalWrite(10,0);
  delay(1000);
 
  digitalWrite(13,1);//1
  digitalWrite(12,0 );
  digitalWrite(11,0 );
  digitalWrite(10,0 );
  delay(1000);

   digitalWrite(13,0);//2
  digitalWrite(12,1);
  digitalWrite(11,0);
  digitalWrite(10,0);
  delay(1000);

   digitalWrite(13,1);//3
  digitalWrite(12,1);
  digitalWrite(11,0);
  digitalWrite(10,0);
  delay(1000);

   digitalWrite(13,0);//4
  digitalWrite(12,0);
  digitalWrite(11,1);
  digitalWrite(10,0);
  delay(1000);

  digitalWrite(13,1);//5
  digitalWrite(12,0);
  digitalWrite(11,1);
  digitalWrite(10,0);
  delay(1000);

  digitalWrite(13,0);//6
  digitalWrite(12,1);
  digitalWrite(11,1);
  digitalWrite(10,0);
  delay(1000);

  digitalWrite(13,1);//7
  digitalWrite(12,1);
  digitalWrite(11,1);
  digitalWrite(10,0);
  delay(1000);
  
  digitalWrite(13,0);//8
  digitalWrite(12,0);
  digitalWrite(11,0);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,1);//9
  digitalWrite(12,0);
  digitalWrite(11,0);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,0);//10
  digitalWrite(12,1);
  digitalWrite(11,0);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,1);//11
  digitalWrite(12,1);
  digitalWrite(11,0);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,0);//12
  digitalWrite(12,0);
  digitalWrite(11,1);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,1);//13
  digitalWrite(12,0);
  digitalWrite(11,1);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,0);//14
  digitalWrite(12,1);
  digitalWrite(11,1);
  digitalWrite(10,1);
  delay(1000);
  digitalWrite(13,1);//15
  digitalWrite(12,1);
  digitalWrite(11,1);
  digitalWrite(10,1);
  delay(1000);
}