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.Arrays;
import java.util.List;
import java.util.Scanner;
import java.util.stream.Collectors;

public class Main {

    // input
    static int n;
    static int k;

    /**
     * input
     */
    static void input(){
        Scanner sc = new Scanner(System.in);
        n = sc.nextInt();
        k = sc.nextInt();
        sc.close();
    }
 
    /**
     * solver
     */
    static void solve(){
        int ans;

        ans = n-k+1;

        System.out.println(ans);
    }

    public static void main(String args[]) {

        input();

        solve();
    }
}
