Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 24°C. We apply continuously 156°C heat to the field 5x5
What is the temperature (rounded to whole numbers) in the field 9x4 after 143 iterations according to the Gauss-Seidel iteration

Field in the beginning

24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424
24242424242424242424

Field after 4 iterations (rounded after 4th iteration)

3678888753
610121314151513105
712151720242420147
8131723354942312010
81420356711076482813
8152449110266119623415
81524427611984533115
7132031486253392512
510142028343125168
357101315151284

Temperature in field 9x4 after 143 iterations: