import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  } 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 sc.close() sc.close sc int ans = (c-(a-b))>0 ? c-(a-b) : 0; ans (c-(a-b))>0 ? c-(a-b) : 0 (c-(a-b))>0 (c-(a-b)) c (a-b) a b 0 c-(a-b) c (a-b) a b 0 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int a = sc.nextInt();
    int b = sc.nextInt();
    int c = sc.nextInt();
    sc.close();
    int ans = (c-(a-b))>0 ? c-(a-b) : 0;
    System.out.println(ans);
  }
}