import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	}} import java.util.Scanner; Scanner java.util import java.util.Set; Set java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	}} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	} main {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int a = sc.nextInt(); a sc.nextInt() sc.nextInt sc int b = sc.nextInt(); b sc.nextInt() sc.nextInt sc int c = sc.nextInt(); c sc.nextInt() sc.nextInt sc int result = c - (a - b); result c - (a - b) c (a - b) a b if (result < 0) result = 0; result < 0 result 0 result = 0 result 0 System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	}} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	}} Main
import java.util.Scanner;
import java.util.Set;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		// 地点数の入力
		int a = sc.nextInt();
		int b = sc.nextInt();
		int c = sc.nextInt();

		int result = c - (a - b);
		
		if (result < 0) result = 0;
		
		System.out.println(result);


	}}