input: import numpy as np
  from sklearn.linear_model import LinearRegression
  
  def predict_value(X, Y, x_input):
      """ Given two lists of integers X and Y, perform linear regression to predict
      the value of y for a given input x.
      >>> predict_value([1,2,3,4,5], [3,5,7,9,13], 7)
      [17.]
      """
      X = np.array(X).reshape(-1,1)
      Y = np.array(Y)
      
      model = LinearRegression()
      model.fit(X, Y)
      
      return model.predict([[x_input]])
output:     X = np.array(X).reshape(-1,1)
      Y = np.array(Y)
      
      model = LinearRegression()
      model.fit(X, Y)
      
      return model.predict([[x_input]])