60 − 50 + 3
70 − 50 + 4
...
14 − 8 + 6
13 − 7 + 5
...
11 − 9 + 8
11 − 8 + 7
...
60 − 50 + 3 = 10 + 3 = 13
70 − 50 + 4 = 20 + 4 = 24
50 − 50 + 5 = 0 + 5 = 5
14 − 8 + 6 = 6 + 6 = 12
13 − 7 + 5 = 6 + 5 = 11
12 − 6 + 4 = 6 + 4 = 10
11 − 9 + 8 = 2 + 8 = 10
11 − 8 + 7 = 3 + 7 = 10
11 − 7 + 6 = 4 + 6 = 10