int led0 = 0;
int led1 = 1;
int led2 = 2;
int led3 = 3;
int led4 = 4;
int led5 = 5;
int led6 = 6;
int led7 = 7;


void setup() {
  pinMode(led0, OUTPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
  pinMode(led7, OUTPUT);
}

void loop() {
  digitalWrite(led0,1);
  digitalWrite(led1,1);
  digitalWrite(led2,1);
  digitalWrite(led3,1);
  digitalWrite(led4,1);
  digitalWrite(led5,1);
  digitalWrite(led6,1);
  digitalWrite(led7,1);
  delay(1000);

  digitalWrite(led0,0);
  digitalWrite(led1,0);
  digitalWrite(led2,0);
  digitalWrite(led3,0);
  digitalWrite(led4,0);
  digitalWrite(led5,0);
  digitalWrite(led6,0);
  digitalWrite(led7,0);
  delay(1000);

}