RB
rb
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num = gets.to_i
case num
when 1
puts "I"
when 2
puts "II"
when 3
puts "III"
when 4
puts "IV"
when 5
puts "V"
when 6
puts "VI"
when 7
puts "VII"
when 8
puts "VIII"
when 9
puts "IX"
when 10
puts "X"
when 11
puts "XI"
when 12
puts "XII"
when 13
puts "XIII"
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OUTPUT
Run