temperature.rb

# Codingame: http://www.codingame.com/ide/?target=clogin&s=1&id=227787048586488d4709f87be22b41eab2321d#!test:247723:true:%2523!list
n = STDIN.gets.to_i
if n == 0
    puts 0
    exit
end

values = STDIN.gets.split(' ').map(&:to_i)


closest = values.shift
closest_distance = closest.abs

values.each do |value|
    distance = value.abs
    next if distance > closest_distance
    if distance < closest_distance || value > closest
        closest = value
        closest_distance = closest.abs
    end
end

puts closest