Snuke has N integers: 1,2,\ldots,N. He will choose K of them and give those to Takahashi.

How many ways are there to choose K consecutive integers?

Constraints

* All values in input are integers.
* 1 \leq K \leq N \leq 50

Input

Input is given from Standard Input in the following format:


N K


Output

Print the answer.

Examples

Input

3 2


Output

2


Input

13 3


Output

11
import java.util.Scanner;
import java.util.InputMismatchException;

public class Main {
    
    public static void main(String[] args) {
        try {
            Scanner scanner = new Scanner(System.in);
            int x = scanner.nextInt();
            int y = scanner.nextInt();
            int result = x - y + 1;
       
            System.out.println(result);
            scanner.close();
          } catch (InputMismatchException e) { 
            System.out.println("整数を入力してください。");
          }
    }
}
