Please answer the given financial question based on the context.
Context: five-year performance comparison 2013 the following graph provides an indicator of cumulative total shareholder returns for the corporation as compared to the peer group index ( described above ) , the dj trans , and the s&p 500 . the graph assumes that $ 100 was invested in the common stock of union pacific corporation and each index on december 31 , 2012 and that all dividends were reinvested . the information below is historical in nature and is not necessarily indicative of future performance . purchases of equity securities 2013 during 2017 , we repurchased 37122405 shares of our common stock at an average price of $ 110.50 . the following table presents common stock repurchases during each month for the fourth quarter of 2017 : period total number of shares purchased [a] average price paid per share total number of shares purchased as part of a publicly announced plan or program [b] maximum number of shares remaining under the plan or program [b] .
|period|total number of shares purchased [a]|average price paid per share|total number of shares purchased as part of a publicly announcedplan or program [b]|maximum number of shares remaining under the plan or program [b]|
|oct . 1 through oct . 31|3831636|$ 113.61|3800000|89078662|
|nov . 1 through nov . 30|3005225|117.07|2937410|86141252|
|dec . 1 through dec . 31|2718319|130.76|2494100|83647152|
|total|9555180|$ 119.58|9231510|n/a|
[a] total number of shares purchased during the quarter includes approximately 323670 shares delivered or attested to upc by employees to pay stock option exercise prices , satisfy excess tax withholding obligations for stock option exercises or vesting of retention units , and pay withholding obligations for vesting of retention shares . [b] effective january 1 , 2017 , our board of directors authorized the repurchase of up to 120 million shares of our common stock by december 31 , 2020 . these repurchases may be made on the open market or through other transactions . our management has sole discretion with respect to determining the timing and amount of these transactions. .
Question: for the fourth quarter of 2017 what was the percent of the total number of shares attested to upc by employees to pay stock option exercise prices
Answer:
0.03387