import java.util.Scanner;
import java.util.Arrays;

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 = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    }
} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays 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 = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    }
} 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 = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    } main {
     Scanner sc = new Scanner(System.in);
     int a = sc.nextInt();
     int b = sc.nextInt();int c = sc.nextInt();
     int ans = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    } 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 = 0; ans 0 int temp = a - b; temp a - b a b ans = c - temp ans c - temp c temp if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);} ans <= 0 ans 0 {
         System.out.println(0);
     } System.out.println(0) System.out.println System.out System System.out 0 {System.out.println(ans);} 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 a = sc.nextInt();
     int b = sc.nextInt();int c = sc.nextInt();
     int ans = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    }
} 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 = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    }
} Main
import java.util.Scanner;
import java.util.Arrays;

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 = 0;
     int temp = a - b;
     ans = c - temp;
     if(ans <= 0){
         System.out.println(0);
     }
     else{System.out.println(ans);}
    }
}