Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 17°C. We apply continuously 143°C heat to the field 2x6
What is the temperature (rounded to whole numbers) in the field 1x1 after 51 iterations according to the Gauss-Seidel iteration

Field in the beginning

17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717
17171717171717171717

Field after 4 iterations (rounded after 4th iteration)

2455666542
4789101010973
5811131313131194
512181918171513105
924383427221815116
1952936541282116126
309023610354332317126
23581007045302116105
143246403021161284
714191815118642

Temperature in field 1x1 after 51 iterations: