const int p1 = 1;
const int p2 = 2;
const int ab1 = 3;
const int ab2 = 4;
const int x1 = 5;
const int x2 = 6;
const int x3 = 7;
const int x4 = 8;

int x1w;
int x2w;
int x3w;
int x4w;

void setup() {
  pinMode(p1, OUTPUT);
  pinMode(p2, OUTPUT);
  pinMode(ab1, OUTPUT);
  pinMode(ab2, OUTPUT);
  pinMode(x1, INPUT);
  pinMode(x2, INPUT);
  pinMode(x3, INPUT);
  pinMode(x4, INPUT);
}

void loop() {
  x1w = digitalRead(x1);
  x2w = digitalRead(x2);
  x3w = digitalRead(x3);
  x4w = digitalRead(x4);

  if (x4w && x3w && x2w && x1w) {
    digitalWrite(ab1, HIGH);
    digitalWrite(ab2, HIGH);
    digitalWrite(p1, LOW);
    digitalWrite(p2, LOW);
  } else if (x4w && x3w && x2w && !x1w) {
    digitalWrite(ab1, HIGH);
    digitalWrite(ab2, LOW);
    digitalWrite(p1, LOW);
    digitalWrite(p2, HIGH);
  } else if (x4w && x3w && !x2w && !x1w) {
    digitalWrite(ab1, LOW);
    digitalWrite(ab2, HIGH);
    digitalWrite(p1, HIGH);
    digitalWrite(p2, LOW);
  } else if (x4w && !x3w && !x2w && !x1w) {
    digitalWrite(ab1, HIGH);
    digitalWrite(ab2, LOW);
    digitalWrite(p1, HIGH);
    digitalWrite(p2, HIGH);
  } else if (!x4w && !x3w && !x2w && !x1w) {
    digitalWrite(ab1, LOW);
    digitalWrite(ab2, LOW);
    digitalWrite(p1, HIGH);
    digitalWrite(p2, HIGH);
  }
}