n c a b s
1 1 2
3 2 1 2 4
4 3 2 3 7
5 5 3 5 12
6 8 5 8 20
Ответ: 20
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n c a b s
1 1 2
3 2 1 2 4
4 3 2 3 7
5 5 3 5 12
6 8 5 8 20
Ответ: 20