input = gets.split.map(&:to_i)
gets・・キーボードで入力した値を文字列で取得
split・・文字列を分割して配列にする、引数を指定しないばあい、空白文字で区切られる
map・・配列の要素の数だけ繰り返し処理を行う、collectと同じ
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