interstate numbers.ipynb

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      "10\n",
      "I-10 is primary, going east/west.\n"
     ]
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   "source": [
    "highway_number = int(input())\n",
    "serving = highway_number % 100\n",
    "\n",
    "if highway_number < 1 or highway_number > 999:\n",
    "    print(highway_number, 'is not a valid interstate highway number.')\n",
    "if highway_number < 100 and highway_number > 0 and (highway_number % 2) == 0:\n",
    "    print('I-{} is primary, going east/west.'.format(highway_number))\n",
    "if highway_number < 100 and highway_number > 0 and (highway_number % 2) != 0:\n",
    "    print('I-{} is primary, going north/south.'.format(highway_number))\n",
    "if highway_number > 99 and highway_number < 1000 and serving % 2 == 0:\n",
    "    print('I-{} is auxiliary, serving I-{}, going east/west.'.format(highway_number, serving))\n",
    "if highway_number > 99 and highway_number < 1000 and serving % 2 != 0:\n",
    "    print('I-{} is auxiliary, serving I-{}, going north/south.'.format(highway_number, serving))\n",
    "\n",
    "\n",
    "#Primary U.S. interstate highways are numbered 1-99. \n",
    "#Odd numbers (like the 5 or 95) go north/south, and evens (like the 10 or 90) go east/west. \n",
    "#Auxiliary highways are numbered 100-999, and service the primary highway indicated by the rightmost two digits. \n",
    "#Thus, I-405 services I-5, and I-290 services I-90."
   ]
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       "35"
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    "35\n"
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