Problem:
Score : 100 points

Problem Statement

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.

Sample Input 1

3 2

Sample Output 1

2

There are two ways to choose two consecutive integers: (1,2) and (2,3).

Sample Input 2

13 3

Sample Output 2

11

Solution in Ruby (2.3.3) (judge verdict: Accepted)

#
# File    : A.rb
# Author  : Kazune Takahashi
# Created : 2019-5-11 21:16:17
# Powered by Visual Studio Code
#

n, k = gets.chomp.split(" ").map{|i| i.to_i}
puts n - k + 1