loop do
puts "\n enter a number for value a"
a = gets.chomp.to_i
if a == "exit" then end
puts "\n enter a number for value b"
b = gets.chomp.to_i
if b == "exit" then end
puts "\n enter a number for value c"
c = gets.chomp.to_i
if c == "exit" then end

    if( (a != b) && (a != c) && (b != c) )
       sum = a + b + c;
       print "total = #{sum}"

    elsif( (a == b) && (a == c) && (b == c) )
       print "total = 1"

    elsif( (a == c) && (b != c) && (b != a))
       sum = b + 1;
      print "total = #{sum}"

    elsif( (a != c) && (a != b) )
       sum = a + 1;
      print "total = #{sum}"

    elsif( (c != a) && (c != b) )
       sum = c + 1;
      print "total = #{sum}"
    end
end