import 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    }
} import java.util.*; util.* java 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    }
} 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    } main {
    	Scanner sc = new Scanner(System.in);
    	int A = sc.nextInt();
    	int B = sc.nextInt();
    	int C = sc.nextInt();
    	int ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 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 int ans = C - (A - B); ans C - (A - B) C (A - B) A B System.out.println(0 <= ans ? ans : 0) System.out.println System.out System System.out 0 <= ans ? ans : 0 0 <= ans 0 ans ans 0 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    }
} 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    }
} Main
import 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 ans = C - (A - B);
    	System.out.println(0 <= ans ? ans : 0);
    }
}