#include <stdio.h>
int main(void)
{
	int N,i;
	scanf("%d%d", &N, &i);
	printf("%d",N-i+1);
	return 0;
}
### Prompt

In CPP, your task is to solve 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(void)
{
	int N,i;
	scanf("%d%d", &N, &i);
	printf("%d",N-i+1);
	return 0;
}
```