import java.util.Scanner;

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();

    if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    }
    
  }
} import java.util.Scanner; Scanner java.util 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();

    if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        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 = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();

    if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    }
    
  } main {

    Scanner sc = new Scanner( System.in );
    int A = sc.nextInt();
    int B = sc.nextInt();
    int C = sc.nextInt();

    if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    }
    
  } 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 if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    } B > A B A {
      System.out.println("Input Error ( B > A )");
    } System.out.println("Input Error ( B > A )") System.out.println System.out System System.out "Input Error ( B > A )" {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    } if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      } C > (A-B) C (A-B) A B {
        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.util.Scanner;

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();

    if ( B > A ) {
      System.out.println("Input Error ( B > A )");
    } else {
      if ( C > (A-B) ) {
        System.out.println(C-(A-B));
      } else {
        System.out.println("0");
      }
    }
    
  }
}