using System;
using System.Collections.Generic;
using System.Linq;

//No.369 足し間違い
class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("4");
            WillReturn.Add("5 1 4 3");
            WillReturn.Add("10");
            //3
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("3");
            WillReturn.Add("2 1 -1");
            WillReturn.Add("0");
            //2
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("3");
            WillReturn.Add("-5 -2 -4");
            WillReturn.Add("0");
            //-11
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        int[] wkArr = { };
        Action<string> SplitAct = pStr =>
            wkArr = pStr.Split(' ').Select(X => int.Parse(X)).ToArray();

        SplitAct(InputList[1]);
        int CorrectSum = wkArr.Sum();

        SplitAct(InputList[2]);
        int YukiAns = wkArr[0];

        Console.WriteLine(CorrectSum - YukiAns);
    }
}