Write a total of 1999 natural numbers from 1 to 1999 from left to right on a piece of paper that is long enough, and then dot a comma every three digits from left to right: 123, 456, 789, 101, 112, ... the 100th What is the number before the comma.
在一张足够长的纸条上从左向右依次写上1～1999共1999个自然数，然后从左到右每隔三位点一个逗号：123，456，789，101，112，…第100个逗号前的那个数字是多少．
<result>136</result>