Sure! Here's a modified version of the program that parses the CSV file without the use of any libraries:

```
def top_five_ips(file_path)
  ip_counts = Hash.new(0)

  File.foreach(file_path) do |line|
    parts = line.strip.split(',')
    ip = parts[0]
    count = parts[1].to_i
    ip_counts[ip] += count
  end

  sorted_ips = ip_counts.sort_by { |_ip, count| -count }

  top_five = sorted_ips[0...5]

  top_five.each do |ip, count|
    puts "#{ip}: #{count} requests"
  end
end

file_path = 'server_log.csv'
top_five_ips(file_path)
```

The program uses the File class to read the log file line by line. For each line, it splits the line into two parts using the split method and the , delimiter. Then, it uses the to_i method to convert the second part of the line (the count) into an integer.

The rest of the program remains unchanged, counting the number of requests for each IP address and sorting the results to find the top 5 IP addresses with the most requests.
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