int Led1 = 12;
int Led2 = 8;
int Led3 = 7;
int Led4 = 4;
int Led5 = 3;
int Led6 = 2;

int pushB = 2;

void setup() {
  pinMode(pushB, INPUT);
  pinMode(Led1, OUTPUT);
  pinMode(Led2, OUTPUT);
  pinMode(Led3, OUTPUT);
  pinMode(Led4, OUTPUT);
  pinMode(Led5, OUTPUT);
  pinMode(Led6, OUTPUT);
}

void loop() {
  int pushBstate=digitalRead(pushB);

  if (pushBstate == LOW) {
    digitalWrite(Led1, HIGH);
  } else {
    digitalWrite(Led1, LOW);
  }
}