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 C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<iostream>
#include<algorithm>
#include<climits>
#include<vector>
#include<utility>
#include<cmath>
#include<string>
#include<cstring>
#include<map>
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define prin(arg) std::cout<<arg<<"\n"
#define prin2(arg1,arg2) std::cout<<arg1<<" "<<arg2<<"\n"
#define fill(arg,n) memset(arg,n,sizeof(arg))
using std::cin;
typedef long long ll;
typedef std::pair<int,int> pi;
typedef std::vector<int> vi;
const int INF=1e+9;
const ll INFLL=1e+17;
int N,K;
int main(){
  cin>>N>>K;
  prin(N-K+1);
  return 0;
}