Blinking of Two LEDs with the Delay of 0.5 Sec

int led1=13;
int led2=12;
int i=0;
void setup()
{
  pinMode(13,OUTPUT);
  pinMode(12,OUTPUT);
  
}
void loop()
{
  for(i=0;i<=5;i++)
  {
  digitalWrite(13,HIGH);
  delay(50);
  digitalWrite(13,LOW);
  delay(50);
  }
  for(i=6;i<=10;i++)
  {
  digitalWrite(12,HIGH);
  delay(50);
  digitalWrite(12,LOW);
  delay(50);
  }
}