Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 30°C. We apply continuously 126°C heat to the field 0x3
What is the temperature (rounded to whole numbers) in the field 9x3 after 50 iterations according to the Gauss-Seidel iteration

Field in the beginning

30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030
30303030303030303030

Field after 4 iterations (rounded after 4th iteration)

8111111111110974
2326242120191816126
6251383127252320158
17883503731282623179
66574537323028251810
30383634323029251910
1827303030292825189
1220242526262522168
814171819191916116
47910101010863

Temperature in field 9x3 after 50 iterations: