27A

import sys
with open("27a.txt") as file:
    sys.stdin = file
    M = 71
    n = int(input())
    a = [ int(input()) for i in range(n) ]

    def solve():
      mxs = 0 # макс. сумма
      ans = 0 # длинна
      for i in range(n):
        s = 0
        for j in range(i, n):
          s += a[j]
          if s % M == 0 and (s > mxs or (s == mxs and j - i + 1 < ans)):
            mxs = s
            ans = j - i + 1
      print(ans)

    solve()