import java.util.*;
import java.util.Arrays;
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 ans = c-a+b;
        if(ans<=0){
            ans = 0;
            System.out.println(ans);
        }
        else{
            System.out.println(ans);
        }


        
        
    }
   
    
       
    
} import java.util.*; util.* java import java.util.Arrays; Arrays 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 ans = c-a+b;
        if(ans<=0){
            ans = 0;
            System.out.println(ans);
        }
        else{
            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();
        int ans = c-a+b;
        if(ans<=0){
            ans = 0;
            System.out.println(ans);
        }
        else{
            System.out.println(ans);
        }


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


        
        
    }
   
    
       
    
} Main
import java.util.*;
import java.util.Arrays;
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 ans = c-a+b;
        if(ans<=0){
            ans = 0;
            System.out.println(ans);
        }
        else{
            System.out.println(ans);
        }


        
        
    }
   
    
       
    
}