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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B; x A-B A B int ans = C-x; ans C-x C x if(ans>=0){
     System.out.println(ans);
      }else{
     System.out.println(0);        
} ans>=0 ans 0 {
     System.out.println(ans);
      } System.out.println(ans) System.out.println System.out System System.out ans {
     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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }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 x = A-B;
      int ans = C-x;
      if(ans>=0){
     System.out.println(ans);
      }else{
     System.out.println(0);        
}
    }
}