import java.util.Scanner;

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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    }
} import java.util.Scanner; Scanner 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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    }
} 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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);

        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();
        int ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    } 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; ans c if (a - b > 0) {
            ans = c - (a - b);
        } a - b > 0 a - b a b 0 {
            ans = c - (a - b);
        } ans = c - (a - b) ans c - (a - b) c (a - b) a b if (ans < 0) {
            ans = 0;
        } ans < 0 ans 0 {
            ans = 0;
        } ans = 0 ans 0 System.out.println(ans) System.out.println System.out System System.out ans sc.close() sc.close sc 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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    }
} 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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    }
} Main
import java.util.Scanner;

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 ans = c;
        if (a - b > 0) {
            ans = c - (a - b);
        }
        if (ans < 0) {
            ans = 0;
        }
        System.out.println(ans);
        sc.close();
    }
}