Arduino exclusive Button 3 way

/*
exclusive button selector
 */

boolean lit1 = 0;
boolean lit2 = 0;
boolean lit3 = 0;
boolean B1old = 0;
boolean B2old = 0;
boolean B3old = 0;
boolean B1new = 0;
boolean B2new = 0;
boolean B3new = 0;
int Pi1 = 8;
int Pi2 = 9;
int Pi3 = 10;
int Po1 = 11;
int Po2 = 12;
int Po3 = 13;

void setup() {
  pinMode(Pi1, INPUT);
  pinMode(Pi2, INPUT);
  pinMode(Pi3, INPUT);
  pinMode(Po1, OUTPUT);
  pinMode(Po2, OUTPUT);
  pinMode(Po3, OUTPUT);
  B1new = digitalRead(Pi1);
  B1old = B1new;
  B2new = digitalRead(Pi2);
  B2old = B2new;
  B3new = digitalRead(Pi3);
  B3old = B3new;
}

int x = 1;

void loop() {
  if (x > 3) {
    x = 1;
  }
  if (x = 1) {
    B1old = B1new;
    B1new = digitalRead(Pi1);
    if (B1new > B1old) {
      lit1 = 1;
      lit2 = 0;
      lit3 = 0;
    }
  }
  if (x = 2) {
    B2old = B2new;
    B2new = digitalRead(Pi2);
    if (B2new > B2old) {
      lit1 = 0;
      lit2 = 1;
      lit3 = 0;
    }
  }
  if (x = 3) {
    B3old = B3new;
    B3new = digitalRead(Pi3);
    if (B3new > B3old) {
      lit1 = 0;
      lit2 = 0;
      lit3 = 1;
    }
  }
  digitalWrite(Po1, lit1);
  digitalWrite(Po2, lit2);
  digitalWrite(Po3, lit3);
  x++;
}