int fairlyValue = (bill.Sum() - bill[k])/2;
int toBeRefund = b - fairlyValue;

if(toBeRefund == 0)
 Console.Write("Bon Appetit");
else
 Console.Write(toBeRefund);

def bonAppetit(bill, k, b):
    # Write your code here
    eaten: int = (sum(bill) - bill[k]) // 2
    print("Bon Appetit" if eaten == b else f"{b - eaten}")

function bonAppetit(bill, k, b) {
  bill.splice(k, 1);
  let billSum = bill.reduce((acc, curValue) => acc + curValue, 0) / 2;
  let toBeRefund = b - billSum;

  return console.log(billSum === b ? "Bon Appetit" : toBeRefund);
}
}

def bonAppetit(bill:list, k, b):
    # Write your code here
    new_bill = bill.copy()
    new_bill.pop(k)
    price = sum(new_bill)/2
    if price == b:
        print('Bon Appetit')
    else:
        print('%d' %(b - price))

def bonAppetit(bill, k, b):
    # Write your code here
    diff = (sum(bill)-bill[k])/2
    if diff == b:
        print('Bon Appetit')
    else:
        print(abs(int(diff-b)))