def calc(n):
n = n // 2 * 2
a = build_matrix_np(n, 1.0)
b = build_matrix_np(n, 2.0)

start = time.time()
d = matmul(a, b)
end = time.time()
time_diff = end - start
print(time_diff)

return d[n // 2][n // 2]