require 'prime'

MAX_NUMBER = 20001
dp = Array.new(MAX_NUMBER, 0)
primes_list = Prime.each(MAX_NUMBER).to_a.reverse
n = gets.chomp.to_i
for i in primes_list do
    dp[i] = 1
end

for i in primes_list do
    # next_prime = Prime.each.find {|e| e >= i+1 }
    for j in (i+1..MAX_NUMBER).to_a.reverse do
        if (j+i) < MAX_NUMBER && dp[j] > 0
            dp[j+i] = [dp[j+i], dp[j]+1].max
        end
    end
end

puts dp[n] > 0 ? dp[n] : -1