diff --git a/.gitignore b/.gitignore
index d485aef..0b1da13 100644
--- a/.gitignore
+++ b/.gitignore
@@ -636,4 +636,7 @@ FodyWeavers.xsd
 *.msix
 *.msm
 *.msp
+
 *.txt
+!CMakeLists.txt
+*.png
diff --git a/Solver.h b/Solver.h
index 5eca8d3..9ea0440 100644
--- a/Solver.h
+++ b/Solver.h
@@ -2,13 +2,13 @@
 
 class Solver {
 private:
-	// ������������ � ��
+	// Коэффициенты в ДУ
 	double A, B, C, D;
-	// ����� ��������� ��������
+	// Длина конечного элемента
 	double L;
-	// ���������� �������� ���������
+	// Количество конечных элементов
 	int N;
-	// ������� �������� ������� ��
+	// Границы частного решения ДУ
 	int upper, lower;
 public:
 	Solver(double _A, double _B, double _C, double _D, int _N, int _l, int _u);
diff --git a/graphics.ipynb b/graphics.ipynb
index a810903..1ae90e8 100644
--- a/graphics.ipynb
+++ b/graphics.ipynb
@@ -8,6 +8,34 @@
     "# Solution of second-order linear ordinary differential equation"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "a4b21c72",
+   "metadata": {},
+   "source": [
+    "## Input vars"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "6653253d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "N = 20\n",
+    "linear_file = f\"matrix_linear_{N}.txt\"\n",
+    "cubic_file = f\"matrix_cubic_{N}.txt\""
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "781047cc",
+   "metadata": {},
+   "source": [
+    "## System cells"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
@@ -37,7 +65,7 @@
    "id": "8af07a56",
    "metadata": {},
    "source": [
-    "## Solution of $5u'' + 4u' + 1 = 0, u'(0) = u(0), u(10) = 5$"
+    "### Solution of $5u'' + 4u' + 1 = 0, u'(0) = u(0), u(10) = 5$"
    ]
   },
   {
@@ -56,7 +84,7 @@
    "id": "efac514a",
    "metadata": {},
    "source": [
-    "## Linear element"
+    "### Linear element"
    ]
   },
   {
@@ -78,8 +106,8 @@
     "    plt.plot(x, y_real, label=\"Numeral solution\", color='black')\n",
     "    plt.title(f\"Linear element, elements = {elements}\")\n",
     "    plt.grid(True)\n",
-    "    plt.xlabel(\"X\")\n",
-    "    plt.ylabel(\"Y\")\n",
+    "    plt.xlabel(\"x\")\n",
+    "    plt.ylabel(\"u(x)\")\n",
     "    plt.legend()\n",
     "    plt.savefig(f\"linear_{elements}.png\", dpi=300)\n",
     "    plt.show()\n",
@@ -92,7 +120,7 @@
    "id": "d9a38740",
    "metadata": {},
    "source": [
-    "## Cubic element"
+    "### Cubic element"
    ]
   },
   {
@@ -110,11 +138,11 @@
     "    y = np.fromstring(data_str, sep=' ')\n",
     "    y_real = u(x)\n",
     "\n",
-    "    plt.plot(x, y, label=\"Cubic element solution\", color=\"green\")\n",
+    "    plt.plot(x, y, label=\"Cubic element solution\", color=\"orange\")\n",
     "    plt.plot(x, y_real, label=\"Numeral solution\", color='black')\n",
     "    plt.title(f\"Cubic element, elements = {elements} \")\n",
-    "    plt.xlabel(\"X\")\n",
-    "    plt.ylabel(\"Y\")\n",
+    "    plt.xlabel(\"x\")\n",
+    "    plt.ylabel(\"u(x)\")\n",
     "    plt.grid(True)\n",
     "    plt.legend()\n",
     "    plt.savefig(f\"cubic_{elements}.png\", dpi=300)\n",
@@ -138,9 +166,8 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "N = 20\n",
-    "show_plot_linear(\"matrix_linear.txt\", N)\n",
-    "show_plot_cubic(\"matrix_cubic.txt\", N)"
+    "show_plot_linear(linear_file, N)\n",
+    "show_plot_cubic(cubic_file, N)"
    ]
   },
   {
@@ -154,7 +181,7 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "e0e9266d",
+   "id": "31de1104",
    "metadata": {},
    "outputs": [],
    "source": [
@@ -162,8 +189,16 @@
     "    with open(filename, 'r') as file:\n",
     "        content = file.read().strip()\n",
     "        data = np.array([float(x) for x in content.split()])\n",
-    "    return data\n",
-    "\n",
+    "    return data"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "e0e9266d",
+   "metadata": {},
+   "outputs": [],
+   "source": [
     "def show_error(program_file: str, analytical_file: str):\n",
     "    # Считывание данных из файлов\n",
     "    real = read_data_from_file(analytical_file)\n",
@@ -192,13 +227,14 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "show_error(\"matrix_linear.txt\", \"linear_real_y_20.txt\")"
+    "show_error(linear_file, f\"linear_real_y_{N}.txt\")\n",
+    "show_error(cubic_file, f\"cubic_real_y_{N}.txt\")"
    ]
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": ".venv",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },