using System;

namespace Add_and_Subtract
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var num1 = int.Parse(Console.ReadLine());
            var num2 = int.Parse(Console.ReadLine());
            var num3 = int.Parse(Console.ReadLine());
            Sum(num1, num2, num3);

        }

        private static void Sum(int num1, int num2, int num3)
        {
            var sum = 0;
            sum = num1 + num2;

            sum = Subtract(sum, num3);
            Console.WriteLine(sum);
        }

        private static int Subtract(int sum, int num3)
        {
            var final = 0;

            final = sum - num3;

            return final;
        }
    }
}