import java.util.Scanner;

public class zMethods_P05_AddAndSubstract {
    public static void main(String[] args) {

        System.out.println(substractTwoNumbers());
    //________________________________________________________________________
    }

    static int substractTwoNumbers() {
        Scanner scanner = new Scanner(System.in);

        int num1 = Integer.parseInt(scanner.nextLine());
        int num2 = Integer.parseInt(scanner.nextLine());
        int num3 = Integer.parseInt(scanner.nextLine());

        int result = sumOfTwoNumbers(num1, num2) - num3;

        return result;

    }

    static int sumOfTwoNumbers(int num1, int num2) {
        int sum = 0;
        sum = num1 + num2;
        return sum;
    }
}