#!/bin/env ruby
# Sum all numbers in the text file.

# Part 1
sum = File.readlines('./input').map { |line| line.to_i}.sum

# Part 2
numbers = File.readlines('./input').map { |line| line.to_i}
freqs = [0]

numbers.cycle do |num|
    freqs.push(freqs[-1] + num)
    break if freqs[0..-2].include?(freqs[-1])
end
puts freqs[-1]