#define btn1 2
#define btn2 4
#define btn3 5
#define LED1 11
#define LED2 12
#define LED3 13
#define restart 7

bool lock = false;

void setup() {
  pinMode(btn1, INPUT);
  pinMode(btn2, INPUT);
  pinMode(btn3, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(restart, INPUT);
}

void loop() {
  if (lock == false){
    if (digitalRead(btn1)==HIGH){
      digitalWrite(LED1, HIGH);
      lock = true;
    }
    else if(digitalRead(btn2)==HIGH){
      digitalWrite(LED2, HIGH);
      lock = true;
    }
    else if(digitalRead(btn3)==HIGH){
      digitalWrite(LED3, HIGH);
      lock = true;
    }
  }
  else {
    if (digitalRead(restart)==HIGH){
      lock = false;
      digitalWrite(LED1, LOW);
      digitalWrite(LED2, LOW);
      digitalWrite(LED3, LOW);
      delay(200);
    }
  }

}