#!/usr/bin/python3

import numpy as np

n = 10

a = -np.eye(n)/2 - np.eye(n, k=1)/2 + np.eye(n, k=2)
a[-2:, -2:] = np.eye(2)

b = np.zeros(n)
b[-2] = 426
b[-1] = 427

x = np.linalg.solve(a, b)
print(x[:2])