Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 35°C. We apply continuously 98°C heat to the field 2x8
What is the temperature (rounded to whole numbers) in the field 2x1 after 77 iterations according to the Gauss-Seidel iteration

Field in the beginning

35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535
35353535353535353535

Field after 4 iterations (rounded after 4th iteration)

5810111212121184
814171920212018147
1017222526272623189
11192528293029262010
12202630323231282111
12223034343433292212
14304443393634292211
19477860463732271910
24671687946322620147
143561412719141174

Temperature in field 2x1 after 77 iterations: