int pinLed[] = {0,1,2,3,4,5,6,7};
int i,j;
void xenke()
{
  static int chay5=0;
  for (chay5=0;chay5<8;chay5+=2)
  digitalWrite(pinLed[chay5], HIGH);
  delay(300);
  for(i=0;i<8;i++)
  digitalWrite(pinLed[i],LOW);
  delay(300);
  for(chay5=1;chay5<8;chay5+=2)
  digitalWrite(pinLed[chay5], HIGH);
  delay(300);
  for(i=0;i<8;i++)
  digitalWrite(pinLed[i],LOW);

}
void setup()
{
  for(i=0;i<=7;i++) 
  pinMode(pinLed[i], OUTPUT);

}
void loop()
{
  xenke();
}