var maxEnvelopes = function(envelopes) {
  //sort by first number?
  envelopes.sort((a,b) => a[0] - b[0]);
  var holder = envelopes[0];
  var holder2 = [];
  var count = 0;

  for (var i = 0; i < envelopes.length - 1; i++) {

    holder2 = envelopes[i+1]
    if ((holder[0] - holder2[0]) < 0 && (holder[1] - holder2[1]) < 0) {
      count++
      holder = envelopes[i]
    }
  }

    //subtract from each number?
      //if its > 1 then count?
  return count;

};