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#!/usr/bin/env ruby
input = $stdin.readlines[0].strip.chars.map(&:to_i)
ilen = input.length
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
m1 = scores[-ilen..-1]
m2 = scores[-ilen-1..-2]
if m1 == input then
puts slen - ilen
break
elsif m2 == input then
puts slen - ilen - 1
break
end
end
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