N 8 8 7 July 8, 2019 16 32 64 128 8 n 7 8 21 N 4 8 7 8 3 8 n 7 8 8 n 8 n 1 72 5 8 n 7 8 8 8 n 70 Solve 3 8 n 7 8 N 8 8