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f(x) = 3 * x 
f(x) = 2 * x - 1 
f(x) = - 2 * x + 1

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f(x) = 3 * a = 3 * 1 = 3
f(x) = 2 * a - 1 = 2 * 1 - 1 = 1
f(x) = - 2 * a + 1 = - 2 * 1 + 1 = -1

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def ´Ø¿ô(²¾°ú¿ô)
 ´Ø¿ô¤ÎÄêµÁ
end

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def f(x)
  3 * x
end

a = gets.chomp.to_i

f(a)

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