a: [18,26,9,26,58,53,35,28,0,47,44,6,24,11,66,48,63,64,3,19,67,55,59,35,37,22,41,8,51,44,3,58,58,9,31,29,20,63,43,19,53,28,40,70,20,46,3,69,34,63,49,29,42,69,26,49,37,26,41,62,7,3,66,55,27,59,9,2,36,24,61,6,7]
i: 26
n: 63
expected: 2203