201611680570.ipynb

{
 "cells": [
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "4\n",
      "10\n"
     ]
    }
   ],
   "source": [
    "n=int(input())\n",
    "i=0\n",
    "total=0\n",
    "while i<n :\n",
    "    i=i+1\n",
    "    total=total+i\n",
    "    \n",
    "print(total)"
   ]
  }
 ],
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   "name": "python3"
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