#!/usr/bin/env ruby

input = $stdin.readlines[0].strip.to_i

scores = [3, 7]
elf1 = 0
elf2 = 1

loop do
  se1 = scores[elf1]
  se2 = scores[elf2]

  sum = se1 + se2
  scores += sum.to_s.chars.map(&:to_i)
  
  slen = scores.length

  elf1 = (elf1 + 1 + se1) % slen
  elf2 = (elf2 + 1 + se2) % slen

  break if slen > (input + 10)
end

puts scores[input...(input+10)].join