#include<stdio.h>

int main(){
    int n, p;
    scanf("%d %d", &n, &p);
    printf("%d", n-p+1);
}

### Prompt

Your challenge is to write a cpp solution to the following problem:

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.

Examples

Input

4 2


Output

3


Input

1 1


Output

1


Input

15 11


Output

5

### Response

```cpp
#include<stdio.h>

int main(){
    int n, p;
    scanf("%d %d", &n, &p);
    printf("%d", n-p+1);
}

```