Level 29

You see a room which is 10x10m wide (0x0 to 9x9).
Every square has the exact temperature of 21°C. We apply continuously 106°C heat to the field 3x4
What is the temperature (rounded to whole numbers) in the field 5x5 after 77 iterations according to the Gauss-Seidel iteration

Field in the beginning

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

Field after 4 iterations (rounded after 4th iteration)

3	5	6	7	8	8	7	6	5	2
5	8	12	16	16	15	14	12	9	4
6	13	23	34	31	25	20	16	11	6
8	22	46	76	55	37	27	20	14	7
11	31	75	183	85	48	32	23	15	8
11	27	53	84	62	43	31	23	16	8
9	21	35	46	42	34	27	21	15	7
8	15	23	29	28	26	22	18	13	6
5	10	15	18	18	17	16	13	9	4
3	5	7	8	9	9	8	6	5	2

Temperature in field 5x5 after 77 iterations:

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	8	8	7	6	5	2
5	8	12	16	16	15	14	12	9	4
6	13	23	34	31	25	20	16	11	6
8	22	46	76	55	37	27	20	14	7
11	31	75	183	85	48	32	23	15	8
11	27	53	84	62	43	31	23	16	8
9	21	35	46	42	34	27	21	15	7
8	15	23	29	28	26	22	18	13	6
5	10	15	18	18	17	16	13	9	4
3	5	7	8	9	9	8	6	5	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	8	8	7	6	5	2
5	8	12	16	16	15	14	12	9	4
6	13	23	34	31	25	20	16	11	6
8	22	46	76	55	37	27	20	14	7
11	31	75	183	85	48	32	23	15	8
11	27	53	84	62	43	31	23	16	8
9	21	35	46	42	34	27	21	15	7
8	15	23	29	28	26	22	18	13	6
5	10	15	18	18	17	16	13	9	4
3	5	7	8	9	9	8	6	5	2

21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21
21	21	21	21	21	21	21	21	21	21

3	5	6	7	8	8	7	6	5	2
5	8	12	16	16	15	14	12	9	4
6	13	23	34	31	25	20	16	11	6
8	22	46	76	55	37	27	20	14	7
11	31	75	183	85	48	32	23	15	8
11	27	53	84	62	43	31	23	16	8
9	21	35	46	42	34	27	21	15	7
8	15	23	29	28	26	22	18	13	6
5	10	15	18	18	17	16	13	9	4
3	5	7	8	9	9	8	6	5	2