const int led1= 8;
const int led2= 7;
const int led3= 6;
const int led4= 5;
const int led5= 4;
const int led6= 3;
const int led7= 2;

void setup() {
  pinMode(8, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, OUTPUT);

}

void loop() {
  digitalWrite(led1, 1);

  digitalWrite(led2, 1);
  
  digitalWrite(led3, 1);
 
  digitalWrite(led4, 1);
  
  digitalWrite(led5, 1);
  
  digitalWrite(led6, 1);
 
  digitalWrite(led7, 1);
delay(1000);

digitalWrite(led1, 0);

  digitalWrite(led2, 0);
  
  digitalWrite(led3, 1);
 
  digitalWrite(led4, 1);
  
  digitalWrite(led5, 0);
  
  digitalWrite(led6, 0);
 
  digitalWrite(led7, 1);
delay(1000);

digitalWrite(led1, 1);

  digitalWrite(led2, 1);
  
  digitalWrite(led3, 0);
 
  digitalWrite(led4, 0);
  
  digitalWrite(led5, 1);
  
  digitalWrite(led6, 1);
 
  digitalWrite(led7, 0);
delay(1000);
 
 
}