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require 'bigdecimal'
# Input the number of numbers
n = readline
# Input the list of numbers
array_list = readline.split(' ')
# Initializing the variables
max1 = BigDecimal("0")
max2 = BigDecimal("0")
min1 = BigDecimal("0")
min2 = BigDecimal("0")
min1_index = 0
max1_index = 0
# Finding the Biggest and Smallest Number and storing their index
array_list.each_with_index do |value, index|
if BigDecimal(value) > 0
if max1 < BigDecimal(value)
max1 = BigDecimal(value)
max1_index = index
end
end
if BigDecimal(value) < 0
if min1 < BigDecimal(value) * -1
min1 = BigDecimal(value) * -1
min1_index = index
end
end
end
#Finding the second biggest and smallest numbers.
array_list.each_with_index do |value, index|
if BigDecimal(value) > 0
max2 = BigDecimal(value) if BigDecimal(value) <= max1 and BigDecimal(value) > max2 and max1_index != index
end
if BigDecimal(value) < 0
min2 = BigDecimal(value) * -1 if BigDecimal(value) >= min1 * -1 and BigDecimal(value) < min2 * -1 and min1_index != index
end
end
#Checking if any of them is 0, else multiplying them accordingly
if( min1 != 0 or min2!= 0 or max1 != 0 or max2 !=0)
if(max1 * max2 < min1 * min2)
result1 = (min1 * min2)
else
result1 = (max1 * max2)
end
else
result1 = min1 * max1
end
#outputting to a format to pass the tests in Coursera
puts result1.to_s("F").split(".")[0]
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