code: function numpf(n, s, t) {
    // s - 2-4, 22-24, 32-34 ...
    // t - 5-21, 25-31, ...
    var n10 = n % 10
    if (n10 > 1 && n10 < 5 && (n > 20 || n < 10)) {
      return s
    } else {
      return t
    }
  }
docs: Polish