using System;
using System.Linq;

namespace No369_1 {
    public class Program {
        public static void Main(string[] args) {
            var sr = new StreamReader();
            //---------------------------------
            Console.WriteLine(sr.Next<int>(sr.Next<int>()).Sum() - sr.Next<int>());
            //---------------------------------
        }
    }

    public class StreamReader {
        private readonly char[] _c = { ' ' };
        private int _index = -1;
        private string[] _input = new string[0];

        public T Next<T>() {
            if(_index == _input.Length - 1) {
                _index = -1;
                while(true) {
                    string rl = Console.ReadLine();
                    if(rl == null) {
                        if(typeof(T).IsClass) return default(T);
                        return (T)typeof(T).GetField("MinValue").GetValue(null);
                    }
                    if(rl != "") {
                        _input = rl.Split(_c, StringSplitOptions.RemoveEmptyEntries);
                        break;
                    }
                }
            }
            return (T)Convert.ChangeType(_input[++_index], typeof(T), System.Globalization.CultureInfo.InvariantCulture);
        }

        public T[] Next<T>(int x) {
            var result = new T[x];
            for(var i = 0; i < x; ++i) {
                result[i] = Next<T>();
            }
            return result;
        }
    }
}