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 (GCC 5.4.1) (judge verdict: Accepted)

#include <cstdio>

inline int readin(){
	int x=0,c;
	for (;(c=getchar())<'0'||c>'9';);
	for (;c>='0'&&c<='9';c=getchar()) x=(x<<1)+(x<<3)+c-48;
	return x;
}

int main(){
	int n=readin(),i=readin();
	printf("%d",n-i+1);
}