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#!/usr/bin/env ruby
def parse_tree(input, start)
num_children = input[start]
num_metadata = input[start + 1]
children = []
next_index = start + 2
while num_children > 0 do
sum, endindex = parse_tree(input, next_index)
children << sum
next_index = endindex + 1
num_children -= 1
end
value = 0
if children.empty?
while num_metadata > 0 do
value += input[next_index]
next_index += 1
num_metadata -= 1
end
else
while num_metadata > 0 do
i = input[next_index]
value += children[i - 1] if i <= children.length
next_index += 1
num_metadata -= 1
end
end
return [ value, next_index - 1 ]
end
input = gets.chomp.split.map(&:to_i)
puts parse_tree(input, 0)[0]
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