Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 18°C. We apply continuously 82°C heat to the field 3x4
What is the temperature (rounded to whole numbers) in the field 4x0 after 82 iterations according to the Gauss-Seidel iteration

Field in the beginning

18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818
18181818181818181818

Field after 4 iterations (rounded after 4th iteration)

3456666642
4710131413121074
511192725201714105
718376044302217126
9256014367392619136
922436749352619137
817283734282318136
613192323211915115
5912151515131184
2467877542

Temperature in field 4x0 after 82 iterations: