Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 40°C. We apply continuously 167°C heat to the field 3x3
What is the temperature (rounded to whole numbers) in the field 9x4 after 140 iterations according to the Gauss-Seidel iteration

Field in the beginning

40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040
40404040404040404040

Field after 4 iterations (rounded after 4th iteration)

69141919171513105
920365247373024179
143674122886144332312
19521222931387954392713
1947881381037354412814
17376179736150402815
15304454545044372714
13243339414037322311
1017232728282723168
5912131415141184

Temperature in field 9x4 after 140 iterations: