diff --git a/cw/03_Entropia.ipynb b/cw/03_Entropia.ipynb
index 3544f51..5edb1a1 100644
--- a/cw/03_Entropia.ipynb
+++ b/cw/03_Entropia.ipynb
@@ -39,10 +39,20 @@
    "metadata": {},
    "outputs": [],
    "source": [
+    "import random\n",
     "from collections import Counter\n",
     "from dahuffman import HuffmanCodec"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 3,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "NR_INDEKSU = 375985"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -52,7 +62,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 3,
+   "execution_count": 4,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -61,7 +71,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -70,7 +80,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [
     {
@@ -92,7 +102,7 @@
        "         's': 1})"
       ]
      },
-     "execution_count": 5,
+     "execution_count": 6,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -103,7 +113,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {
     "scrolled": true
    },
@@ -137,7 +147,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
@@ -160,7 +170,7 @@
        " 's': (5, 31)}"
       ]
      },
-     "execution_count": 7,
+     "execution_count": 8,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -171,7 +181,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -180,7 +190,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 9,
+   "execution_count": 10,
    "metadata": {},
    "outputs": [
     {
@@ -189,7 +199,7 @@
        "'1010010111010011010100110011100100001100110010101011111010110110000110101001110111111011'"
       ]
      },
-     "execution_count": 9,
+     "execution_count": 10,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -214,7 +224,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 10,
+   "execution_count": 11,
    "metadata": {},
    "outputs": [
     {
@@ -223,7 +233,7 @@
        "'Ala ma kota. Jarek ma psa'"
       ]
      },
-     "execution_count": 10,
+     "execution_count": 11,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -234,7 +244,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 11,
+   "execution_count": 12,
    "metadata": {},
    "outputs": [
     {
@@ -243,7 +253,7 @@
        "25"
       ]
      },
-     "execution_count": 11,
+     "execution_count": 12,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -254,7 +264,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 12,
+   "execution_count": 13,
    "metadata": {},
    "outputs": [
     {
@@ -263,7 +273,7 @@
        "11"
       ]
      },
-     "execution_count": 12,
+     "execution_count": 13,
      "metadata": {},
      "output_type": "execute_result"
     }
@@ -276,7 +286,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Zadanie 1 ( 30 punktów)\n",
+    "## Zadanie 1 ( 15 punktów)\n",
     "\n",
     "Weź teksty:\n",
     "- z poprzednich zajęć (lub dowolny inny) w języku naturalnym i obetnij do długości 100_000 znaków\n",
@@ -352,12 +362,20 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "## Zadanie 2 \n",
+    "## Zadanie 2 (10 punktów)\n",
     "\n",
     "Powtórz kroki z zadania 1, tylko potraktuje wiadomości jako słowa (oddzielone spacją). Jeżeli występują więcej niż jedna spacja równocześnie- usuń je.\n",
     " \n",
     "Do wniosków dopisz koniecznie porównanie między kodowaniem hoffmana znaków i słów.\n",
     "\n",
+    "\n",
+    "\n"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
     "### START ZADANIA"
    ]
   },
@@ -403,6 +421,74 @@
     "### KONIEC ZADANIA"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Zadanie 3 (20 punktów)\n",
+    "\n",
+    "stwórz ręcznie drzewo Huffmana (zrób rysunki na kartce i załącz je jako obrazek) oraz zakoduj poniższy tekst "
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 14,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "random.seed(123)\n",
+    "\n",
+    "tekst = list('abcdefghijklmnoprst')\n",
+    "\n",
+    "random.shuffle(tekst)\n",
+    "\n",
+    "tekst = tekst[: 5 + random.randint(1,5)]\n",
+    "\n",
+    "tekst = [a*random.randint(1,4) for a in tekst]\n",
+    "\n",
+    "tekst = [item for sublist in tekst for item in sublist]\n",
+    "\n",
+    "''.join(tekst)\n",
+    "\n",
+    "random.shuffle(tekst)\n",
+    "\n",
+    "tekst = ''.join(tekst)"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 15,
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "'ldddmpprphhopd'"
+      ]
+     },
+     "execution_count": 15,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "tekst"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Start zadania"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "### Koniec zadania"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},