wrong answer
expected:
21
10
13
15
21
6
10
13
1
18
15
10
6
15
1
10
18
1
21
3
1
6
10
6
10
18
17
13
6
6
21
6
10
6
21
1
3
3
1
1
1
1
3
1
19
6
15
6
3
6
21
3
15
21
10
6
6
10
20
6
10
3
10
6
10
15
6
15
6
3
10
20
3
3
1
15
13
9
6
10
19
15
10
10
3
1
15
1
3
19
21
21
10
3
14
15
1
17
3
21
got:
21
exit status 1