Условие:

2 * 4 + 7;
3 * 5 + 8;
6 * 39;
7 * 26;
6 + 67 + 8;
8 + 97 + 3;
1 * 26;
0 * 14.

2 * 4 + 7 = 8 + 7 = 15;
3 * 5 + 8 = 15 + 8 = 23;
6 * 39 = 189 = 9;
7 * 26 = 146 = 8;
6 + 67 + 8 = 127 + 8 = 5 + 8 = 13;
8 + 97 + 3 = 177 + 3 = 10 + 3 = 13;
1 * 26 = 26;
0 * 14 = 0.