const int LED_Pin[6]={13,12,11,10,9,8};
int i,j;
int Cont_P=3;
void setup() {
  // put your setup code here, to run once:
pinMode(7, INPUT);
for (i=0;i<6;i++){
  pinMode(LED_Pin[i], OUTPUT);
}
digitalWrite(LED_Pin[Cont_P], HIGH);
}

void loop() {
  // put your main code here, to run repeatedly:
if(digitalRead(7)==0){
  digitalWrite(LED_Pin[Cont_P], LOW);
  Cont_P++;
  if(Cont_P>=6)Cont_P=0;
  digitalWrite(LED_Pin[Cont_P], HIGH);
  delay(500);
}
}