diff --git a/Aigrind/Analisys.ipynb b/Aigrind/Analisys.ipynb
index bdb13de..30138fa 100644
--- a/Aigrind/Analisys.ipynb
+++ b/Aigrind/Analisys.ipynb
@@ -220,88 +220,28 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 19,
+   "execution_count": 36,
    "id": "a0f238ba",
    "metadata": {},
    "outputs": [
     {
      "data": {
-      "text/html": [
-       "<div>\n",
-       "<style scoped>\n",
-       "    .dataframe tbody tr th:only-of-type {\n",
-       "        vertical-align: middle;\n",
-       "    }\n",
-       "\n",
-       "    .dataframe tbody tr th {\n",
-       "        vertical-align: top;\n",
-       "    }\n",
-       "\n",
-       "    .dataframe thead th {\n",
-       "        text-align: right;\n",
-       "    }\n",
-       "</style>\n",
-       "<table border=\"1\" class=\"dataframe\">\n",
-       "  <thead>\n",
-       "    <tr style=\"text-align: right;\">\n",
-       "      <th></th>\n",
-       "      <th>account_id</th>\n",
-       "      <th>created_date</th>\n",
-       "      <th>campaign</th>\n",
-       "    </tr>\n",
-       "  </thead>\n",
-       "  <tbody>\n",
-       "    <tr>\n",
-       "      <th>0</th>\n",
-       "      <td>3842380.0</td>\n",
-       "      <td>2021-01-01</td>\n",
-       "      <td>BRA_MS1_install</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>1</th>\n",
-       "      <td>3842381.0</td>\n",
-       "      <td>2021-01-01</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>2</th>\n",
-       "      <td>3842382.0</td>\n",
-       "      <td>2021-01-01</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>3</th>\n",
-       "      <td>3842383.0</td>\n",
-       "      <td>2021-01-01</td>\n",
-       "      <td>NaN</td>\n",
-       "    </tr>\n",
-       "    <tr>\n",
-       "      <th>4</th>\n",
-       "      <td>3842384.0</td>\n",
-       "      <td>2021-01-01</td>\n",
-       "      <td>BRA_MS1_install</td>\n",
-       "    </tr>\n",
-       "  </tbody>\n",
-       "</table>\n",
-       "</div>"
-      ],
       "text/plain": [
-       "   account_id created_date         campaign\n",
-       "0   3842380.0   2021-01-01  BRA_MS1_install\n",
-       "1   3842381.0   2021-01-01              NaN\n",
-       "2   3842382.0   2021-01-01              NaN\n",
-       "3   3842383.0   2021-01-01              NaN\n",
-       "4   3842384.0   2021-01-01  BRA_MS1_install"
+       "array(['BRA_MS1_install', 'RUS_MS1_install', 'UKR_MS1_install',\n",
+       "       'BRA_MS1_purchase', 'RUS_MS1_purchase', 'PR_youtube_bloger',\n",
+       "       'UKR_MS1_purchase', 'ENG_MS2_install', 'BRA_MS2_install', 'our_fb'],\n",
+       "      dtype=object)"
       ]
      },
-     "execution_count": 19,
+     "execution_count": 36,
      "metadata": {},
      "output_type": "execute_result"
     }
    ],
    "source": [
-    "registrations = pd.read_csv(\"data/registrations.csv\", index_col=0)\n",
-    "registrations.head()"
+    "registrations = pd.read_csv(\"data/registrations.csv\", index_col=0).dropna()\n",
+    "registrations.head()\n",
+    "registrations['campaign'].unique()"
    ]
   },
   {
@@ -495,10 +435,48 @@
     "## Оптимальный срок окупаемости"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "1701b5e5",
+   "metadata": {},
+   "source": [
+    "$$\\Large\n",
+    "T = \\frac{IC}{FV}\n",
+    "$$\n",
+    "\n",
+    "где:\n",
+    "\n",
+    "- $\\large T$  — срок окупаемости\n",
+    "- $\\large IC$ — инвестиционные расходы\n",
+    "- $\\large FV$ — прибыль"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 43,
+   "id": "33a0a78b",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "['BRA_MS1_install']"
+      ]
+     },
+     "execution_count": 43,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "campaigns = list(registrations['campaign'].unique()[:1])\n",
+    "campaigns"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": null,
-   "id": "f5e6e89a",
+   "id": "35f2e77d",
    "metadata": {},
    "outputs": [],
    "source": []