import java.util.*;
public class Main {
    public static void main (String[]args){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    }   
} import java.util.*; util.* java public class Main {
    public static void main (String[]args){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    }   
} Main public static void main (String[]args){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    } main {
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } 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 sc.close() sc.close sc int full = A - B; full A - B A B int rest = C - full; rest C - full C full if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        } rest >= 0 rest 0 {
            System.out.println(rest);
        } System.out.println(rest) System.out.println System.out System System.out rest {
            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){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    }   
} public class Main {
    public static void main (String[]args){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    }   
} Main
import java.util.*;
public class Main {
    public static void main (String[]args){
        // 標準入力
        Scanner sc = new Scanner(System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();

        sc.close();

        int full = A - B;
        int rest = C - full;

        if (rest >= 0){
            System.out.println(rest);
        } else{
            System.out.println(0);
        }
        

    }   
}