import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    }
} import java.util.*; util.* java public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    }
} Main public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    } main {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    } 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 result = 0; result 0 if (c - (a - b) >= 0) result = c - (a - b); c - (a - b) >= 0 c - (a - b) c (a - b) a b 0 result = c - (a - b) result c - (a - b) c (a - b) a b System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    }
} public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        
        int result = 0;
        if (c - (a - b) >= 0) result = c - (a - b);
        System.out.println(result);
    }
}
