int led1=2;
  int led2=2;
  int led3=3;
  int led4=4;
  int led5=5;
  int led6=6;
  int led7=7;
  int led8=8;
 void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(led1, OUTPUT);
  digitalWrite(led1, LOW);
  pinMode(led2, OUTPUT);
  digitalWrite(led2, LOW);
  pinMode(led3, OUTPUT);
  digitalWrite(led3, LOW);
  pinMode(led4, OUTPUT);
  digitalWrite(led4, LOW);
pinMode(led5, OUTPUT);
  digitalWrite(led5, LOW);
pinMode(led6, OUTPUT);
  digitalWrite(led6, LOW);
pinMode(led7, OUTPUT);
  digitalWrite(led7, LOW);
pinMode(led8, OUTPUT);
  digitalWrite(led8, LOW);




}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(led2, HIGH);
  digitalWrite(led4, HIGH);
  digitalWrite(led6, HIGH);
  digitalWrite(led8, HIGH);
  delay(100);
  digitalWrite(led2, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led6, LOW);
  digitalWrite(led8, LOW);
  delay(100);
  digitalWrite(led1,HIGH);
  digitalWrite(led3,HIGH);
  digitalWrite(led5,HIGH);
  digitalWrite(led7,HIGH);
  delay(100);
  digitalWrite(led1,LOW);
  digitalWrite(led3,LOW);
  digitalWrite(led5,LOW);
  digitalWrite(led7,LOW);
  delay(100);
}