import java.util.Scanner;

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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    }
} import java.util.Scanner; Scanner 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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    }
} 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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    } main {
        Scanner sc = new Scanner(System.in);
        int A = sc.nextInt();
        int B = sc.nextInt();
        int C = sc.nextInt();
        
        int cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    } 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 cap = A - B; cap A - B A B if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        } cap > 0 cap 0 {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            } (C - cap >= 0) C - cap C cap 0 {
                System.out.println(C - cap);
            } System.out.println(C - cap) System.out.println System.out System System.out C - cap C cap {
                System.out.println(0);
            } System.out.println(0) System.out.println System.out System System.out 0 {
            System.out.println(C);
        } System.out.println(C) System.out.println System.out System System.out C 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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    }
} 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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    }
} Main
import java.util.Scanner;

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 cap = A - B;
        
        if (cap > 0) {
            if ((C - cap >= 0)) {
                System.out.println(C - cap);
            } else {
                System.out.println(0);
            }
        } else {
            System.out.println(C);
        }
    }
}