import java.util.*;

public 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());
        
        if(c - (a - b) >= 0) {
            System.out.println(c - (a - b));
        }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 = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        int c = Integer.parseInt(sc.next());
        
        if(c - (a - b) >= 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());
        
        if(c - (a - b) >= 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());
        
        if(c - (a - b) >= 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 if(c - (a - b) >= 0) {
            System.out.println(c - (a - b));
        }else {
            System.out.println(0);
        } c - (a - b) >= 0 c - (a - b) c (a - b) a b 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 public 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());
        
        if(c - (a - b) >= 0) {
            System.out.println(c - (a - b));
        }else {
            System.out.println(0);
        }
    }
    
} public 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());
        
        if(c - (a - b) >= 0) {
            System.out.println(c - (a - b));
        }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 = Integer.parseInt(sc.next());
        int b = Integer.parseInt(sc.next());
        int c = Integer.parseInt(sc.next());
        
        if(c - (a - b) >= 0) {
            System.out.println(c - (a - b));
        }else {
            System.out.println(0);
        }
    }
    
}