import java.io.*;
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = Integer.parseInt(sc.next());
    int B = Integer.parseInt(sc.next());
    int C = Integer.parseInt(sc.next());
    
    int ans = C - (A - B);
    if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    }
  }
} import java.io.*; io.* java import java.util.*; util.* java class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = Integer.parseInt(sc.next());
    int B = Integer.parseInt(sc.next());
    int C = Integer.parseInt(sc.next());
    
    int ans = C - (A - B);
    if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    }
  }
} Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = Integer.parseInt(sc.next());
    int B = Integer.parseInt(sc.next());
    int C = Integer.parseInt(sc.next());
    
    int ans = C - (A - B);
    if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    }
  } main {
    Scanner sc = new Scanner(System.in);
    int A = Integer.parseInt(sc.next());
    int B = Integer.parseInt(sc.next());
    int C = Integer.parseInt(sc.next());
    
    int ans = C - (A - B);
    if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    }
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = Integer.parseInt(sc.next()); A Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int B = Integer.parseInt(sc.next()); B Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int C = Integer.parseInt(sc.next()); C Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int ans = C - (A - B); ans C - (A - B) C (A - B) A B if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    } ans > 0 ans 0 {
      System.out.println(C - (A - B));
    } System.out.println(C - (A - B)) System.out.println System.out System System.out C - (A - B) C (A - B) A B {
      System.out.println(0);
    } System.out.println(0) System.out.println System.out System System.out 0 String[] args args
import java.io.*;
import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = Integer.parseInt(sc.next());
    int B = Integer.parseInt(sc.next());
    int C = Integer.parseInt(sc.next());
    
    int ans = C - (A - B);
    if (ans > 0) {
      System.out.println(C - (A - B));
    } else {
      System.out.println(0);
    }
  }
}