No. 8.
The font sizes of Chinese characters, calculated according to the number system, include No. 1 (Lao Chu Hao, 42P), No. 1 (No. 1, 27.5P), No. 2 (21P), No. 3 (16P), No. 4 (13.75P), No. 5 (10.5P), No. 6 (8P), No. 7 (5.25P). Calculated according to the point system, there are Xin No. 1 (Small Chu No., 36P), Xin No. 4 (Small No. 4, 12P), and Xin No. 5 (Small No. 5, 9P).