Hacker Rank Bon Appetit

    'use strict';

process.stdin.resume();
process.stdin.setEncoding('utf-8');

let inputString = '';
let currentLine = 0;

process.stdin.on('data', function(inputStdin) {
    inputString += inputStdin;
});

process.stdin.on('end', function() {
    inputString = inputString.split('\n');

    main();
});

function readLine() {
    return inputString[currentLine++];
}

/*
 * Complete the 'bonAppetit' function below.
 *
 * The function accepts following parameters:
 *  1. INTEGER_ARRAY bill
 *  2. INTEGER k
 *  3. INTEGER b
 */

function bonAppetit(bill, k, b) {
    // Write your code here
    let res = 0
    for(let i = 0 ; i < bill.length ; i++ ){
        if(bill[i] == bill[k]){
            continue
        }
        res += bill[i]
    }
    res /= 2
    if(res==b)
    {
        console.log("Bon Appetit")
    }else if(b>res){
        console.log(b - res)
    } else{
        console.log(res - b)
    }
    console.log(bill, k, b)
}

function main() {
    const firstMultipleInput = readLine().replace(/\s+$/g, '').split(' ');

    const n = parseInt(firstMultipleInput[0], 10);

    const k = parseInt(firstMultipleInput[1], 10);

    const bill = readLine().replace(/\s+$/g, '').split(' ').map(billTemp => parseInt(billTemp, 10));

    const b = parseInt(readLine().trim(), 10);

    bonAppetit(bill, k, b);
}