Write a program to print the sum of the first K natural numbers.

Write a program to print the sum of the first K natural numbers.
Input Size : n <= 100000
Sample Testcase :
INPUT
3
OUTPUT
6


const readline = require('readline');
 const inp = readline.createInterface({
  input: process.stdin
 });
 const userInput = [];
 inp.on("line", (data) => {
 userInput.push(data);
 });
 inp.on("close", () => {
 var data = userInput[0].split(" ");
 var a = parseInt(data[0]);
 var total=0;
 for (i=0;i<=a;i++)
 {total=total+i}
console.log(total)
});

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