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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    }
  }
} 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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    }
  } main {
    Scanner sc=new Scanner(System.in);
    int a=sc.nextInt();
    int b=sc.nextInt();
    int c=sc.nextInt();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }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 int o1=a-b; o1 a-b a b int o2=c-o1; o2 c-o1 c o1 if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    } o2>0 o2 0 {
      System.out.println(o2);
    } System.out.println(o2) System.out.println System.out System System.out o2 {
      System.out.println(0);
    } System.out.println(0) System.out.println System.out System System.out 0 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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    }
  }
} 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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    }
  }
} 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();

    int o1=a-b;
    int o2=c-o1;
    if(o2>0){
      System.out.println(o2);
    }else{
      System.out.println(0);
    }
  }
}
