import java.util.*;
public class Main {
public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	}
} import java.util.*; util.* java public class Main {
public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	}
} Main public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	} main {
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int numA = sc.nextInt(); numA sc.nextInt() sc.nextInt sc int numB = sc.nextInt(); numB sc.nextInt() sc.nextInt sc int numC = sc.nextInt(); numC sc.nextInt() sc.nextInt sc int ans = numC - (numA - numB); ans numC - (numA - numB) numC (numA - numB) numA numB if(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 String[] args args public class Main {
public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	}
} public class Main {
public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	}
} Main
import java.util.*;
public class Main {
public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
  	int numA = sc.nextInt();
  	int numB = sc.nextInt();
  	int numC = sc.nextInt();
  	
  	int ans = numC - (numA - numB);
  	if(ans < 0) ans = 0;
  
  	System.out.println(ans);
  
	}
}