int i=1;

void setup() {
  // put your setup code here, to run once:
pinMode(i, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
for (i; i<7; i=i+1);
digitalWrite(i,HIGH);
delay(40);
digitalWrite(i,LOW);
}

for(i; i<7; i=i+1);
digitalWrite(i,HIGH);
delay(40);
digitalWrite(i,LOW);
}

}