#!/usr/bin/env ruby
# -*- coding: utf-8 -*-


count = 0

while count <10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
  count += 1
  if count % 5 !=0
    next
  end
  printf("5の倍数は%d\n", count)
end