Package : IO {
  Char x1;
  Char x0;
  Integer(0, 1, 1, 0) acc;
  Integer main {
    INIT acc;
    charGet(x1);
    charGet(x0);
    If !(x1 ^ 48) Then {
    }
    If x1 ^ 48 Then {
    If !(x0 ^ 48) Then {
    }
    If x0 ^ 48 Then {
    INCR acc;
    }
    }
    charPut(48 ^ acc);
    0;
  }
} truthTable;
