test 1 failed
input:
10 63
expected:63
9 1 2 3 4 5 6 7 8 10
1 2 3 4 5 6 7 8 9 10
actual:63
1 2 3 4 5 6 7 8 9 10
9 2 3 4 5 6 7 8 1 10