what was total net undeveloped acres expiring for the three year period , in thousands?
Important information:
table_1: ( in thousands ) the u.s . of net undeveloped acres expiring year ended december 31 , 2016 is 68 ; the u.s . of net undeveloped acres expiring year ended december 31 , 2017 is 89 ; the u.s . of net undeveloped acres expiring year ended december 31 , 2018 is 128 ;
table_4: ( in thousands ) the total africa of net undeveloped acres expiring year ended december 31 , 2016 is 189 ; the total africa of net undeveloped acres expiring year ended december 31 , 2017 is 4444 ; the total africa of net undeveloped acres expiring year ended december 31 , 2018 is 890 ;
table_6: ( in thousands ) the total of net undeveloped acres expiring year ended december 31 , 2016 is 257 ; the total of net undeveloped acres expiring year ended december 31 , 2017 is 4533 ; the total of net undeveloped acres expiring year ended december 31 , 2018 is 1018 ;
Reasoning Steps:
Step: sum2-1(total, none) = 5808
Program:
table_sum(total, none)
Program (Nested):
table_sum(total, none)

Please answer the following financial question based on the context provided. Make sure to give the answer in raw number, not in percentage and without any units. If the question asks for percentage the value should be less than 1
Context:
in the ordinary course of business , based on our evaluations of certain geologic trends and prospective economics , we have allowed certain lease acreage to expire and may allow additional acreage to expire in the future . if production is not established or we take no other action to extend the terms of the leases , licenses or concessions , undeveloped acreage listed in the table below will expire over the next three years . we plan to continue the terms of certain of these licenses and concession areas or retain leases through operational or administrative actions ; however , the majority of the undeveloped acres associated with other africa as listed in the table below pertains to our licenses in ethiopia and kenya , for which we executed agreements in 2015 to sell . the kenya transaction closed in february 2016 and the ethiopia transaction is expected to close in the first quarter of 2016 . see item 8 . financial statements and supplementary data - note 5 to the consolidated financial statements for additional information about this disposition . net undeveloped acres expiring year ended december 31 .
Table
( in thousands )    | net undeveloped acres expiring year ended december 31 , 2016 | net undeveloped acres expiring year ended december 31 , 2017 | net undeveloped acres expiring year ended december 31 , 2018
u.s .               | 68                                                           | 89                                                           | 128                                                         
e.g .               | 2014                                                         | 92                                                           | 36                                                          
other africa        | 189                                                          | 4352                                                         | 854                                                         
total africa        | 189                                                          | 4444                                                         | 890                                                         
other international | 2014                                                         | 2014                                                         | 2014                                                        
total               | 257                                                          | 4533                                                         | 1018                                                        
.
Question: 
what was total net undeveloped acres expiring for the three year period , in thousands?
Important information:
table_1: ( in thousands ) the u.s . of net undeveloped acres expiring year ended december 31 , 2016 is 68 ; the u.s . of net undeveloped acres expiring year ended december 31 , 2017 is 89 ; the u.s . of net undeveloped acres expiring year ended december 31 , 2018 is 128 ;
table_4: ( in thousands ) the total africa of net undeveloped acres expiring year ended december 31 , 2016 is 189 ; the total africa of net undeveloped acres expiring year ended december 31 , 2017 is 4444 ; the total africa of net undeveloped acres expiring year ended december 31 , 2018 is 890 ;
table_6: ( in thousands ) the total of net undeveloped acres expiring year ended december 31 , 2016 is 257 ; the total of net undeveloped acres expiring year ended december 31 , 2017 is 4533 ; the total of net undeveloped acres expiring year ended december 31 , 2018 is 1018 ;
Reasoning Steps:
Step: sum2-1(total, none) = 5808
Program:
table_sum(total, none)
Program (Nested):
table_sum(total, none)
