int x = 2;
void setup() {
  // put your setup code here, to run once:
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5, OUTPUT);
 pinMode(6, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(x, HIGH);
  delay (1000);
  digitalWrite(x, LOW);
  delay (1000);
  x=x+1;
  if (x==7) { 
     x= 2;
  } 
}