4m 12 8 July 8, 2019 16 32 64 128 4m 12 8 m 4m 8m =- 12 4m 4 8 12 4m 2 8m 12 12 4m 5 8m 4m 2 8m 12 0 12 4m ≤ 5 8m 4m + 12