Problem:
Score : 100 points

Problem Statement

There is an N-car train.

You are given an integer i. Find the value of j such that the following statement is true: "the i-th car from the front of the train is the j-th car from the back."

Constraints

1 \leq N \leq 100

1 \leq i \leq N

Input

Input is given from Standard Input in the following format:

N i

Output

Print the answer.

Sample Input 1

4 2

Sample Output 1

3

The second car from the front of a 4-car train is the third car from the back.

Sample Input 2

1 1

Sample Output 2

1

Sample Input 3

15 11

Sample Output 3

5

Solution in C++14 (Clang 3.8.0) (judge verdict: Accepted)

#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<map>
#include<set>
#include<queue>

using namespace std;

#define rep(i, n) for(int i = 0; i < n; i++)
#define repn(i, n) for(int i = 1; i <= n; i++)
#define repr(i, n) for(int i = (n-1); i >= 0; i--)
#define all(x) (x).begin(), (x).end()
#define lint long long

int main(){
    int N, i; cin >> N >> i;
    cout << (N+1-i) << endl;
}