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;
public class Main{
	public static void main(String[] args){
		// TODO 自動生成されたメソッド・スタブ
		Scanner scan=new Scanner(System.in);
		int a=scan.nextInt();
		int b=scan.nextInt();
		//int c=scan.nextInt();
		//int d=scan.nextInt();
		//int f=scan.nextInt();
		//String str=scan.next();
		boolean bool=false;
		int ans=0;
		System.out.println(a-b+1);
	}
}