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yukicoder No.026
# [No.26 シャッフルゲーム - yukicoder](http://yukicoder.me/problems/74)
n = gets.chomp.to_i
m = gets.chomp.to_i
cups = Array.new(4, false)
cups[n] = true
m.times do
p_, q_ = gets.chomp.split(" ").map(&:to_i)
cups[p_], cups[q_] = cups[q_], cups[p_]
end
puts cups.index(true)
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