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 (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>

int Pow(int n, int m);
int Max(int N[], int n);
int Sum(int N[], int n);

#define St 500

int main()
{
	int a = 0, b = 0;
	scanf("%d%d", &a, &b);
	printf("%d", a - b + 1);

	return 0;
}

int Pow(int n, int m) {
	int ret = 1;

	for (int i = 0; i < m; i++) {
		ret *= n;
	}

	return ret;
}

int Max(int N[], int n) {
	int max = 0;

	for (int i = 0; i < n; i++) {
		max = max < N[i] ? N[i]: max;
	}

	return max;
}

int Sum(int N[], int n) {
	int sum = 0;

	for (int i = 0; i < n; i++) {
		sum += N[i];
	}

	return sum;
}