const int pinsOUT [] = {10, 9, 8};
const int pinsIN [] = {7, 6, 5};

void setup() {
  for (int i = 0; i < 3; i++) {
    pinMode(pinsOUT[i], OUTPUT);
    pinMode(pinsIN[i], INPUT);
  }
}

void loop() {
  digitalWrite(10, LOW);
  digitalWrite(9,  LOW);
  digitalWrite(8,  LOW);

  if (digitalRead(7) == HIGH) {
    digitalWrite(10, HIGH);
  }
  if (digitalRead(6) == HIGH) {
    digitalWrite(9,  HIGH);
  }
  if (digitalRead(5) == HIGH) {
    digitalWrite(8,  HIGH);
  }
  delay(20);
}