
Score : 100 points
Problem StatementThere 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
InputInput is given from Standard Input in the following format:
N i
OutputPrint the answer.
Sample Input 14 2
Sample Output 13
The second car from the front of a 4-car train is the third car from the back.
Sample Input 21 1
Sample Output 21
Sample Input 315 11
Sample Output 35
