  1  2  3  4  5  6  7  8 ->  8
  1  3  5  7  8 17 18 -> 26
  1  4  6 14 17 29 -> 52
  1  3 11 15 32 -> 70
  1  5 12 28 -> 71
  1  7 12 -> 52
  1  5 -> 23
  1 ->  8
  1  2  3  4  5  6  7 ->  7
  1  3  5  7  9 10 -> 20
  1  4  6 14 15 -> 36
  1  3 11 18 -> 44
  1  6  7 -> 35
  1  5 -> 18
  1 ->  7
  1 ->  1
