import java.util.*;
import java.io.*;
public class Main{
    public static void main (String [] args){
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        int b = in.nextInt();
        if(a>b){
            System.out.println("0");
        }else{
            System.out.println(b-a+1);
        }
    }
}