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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function main(input){
  const lines = input.split('\n');
  const N = lines[0].split(' ').map(x => parseInt(x))[0];
  const K = lines[0].split(' ').map(x => parseInt(x))[1];


  console.log(N-K+1)

}

main(require('fs').readFileSync('/dev/stdin', 'utf8'));