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    "# Write a Python class to convert a roman numeral to an integer\n",
    "\n",
    "# Sample input\n",
    "# 'MMMCMLXXXVI'\n",
    "# 'MMMM'\n",
    "# 'C'\n",
    "\n",
    "# Sample output\n",
    "# 3986                                                                                                          \n",
    "# 4000                                                                                                          \n",
    "# 100\n",
    "\n",
    "class py_solution:\n",
    "    def roman_to_int(self, s):\n",
    "        rom_val = {'I': 1, 'V': 5, 'X': 10, 'L': 50, 'C': 100, 'D': 500, 'M': 1000}\n",
    "        int_val = 0\n",
    "        for i in range(len(s)):\n",
    "            if i > 0 and rom_val[s[i]] > rom_val[s[i - 1]]:\n",
    "                int_val += rom_val[s[i]] - 2 * rom_val[s[i - 1]]\n",
    "            else:\n",
    "                int_val += rom_val[s[i]]\n",
    "        return int_val\n",
    "\n",
    "print(py_solution().roman_to_int('MMMCMLXXXVI'))\n",
    "print(py_solution().roman_to_int('MMMM'))\n",
    "print(py_solution().roman_to_int('C'))"
   ]
  }
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