Score : 100 points
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."
Input is given from Standard Input in the following format:
N i
Print the answer.
4 2
3
The second car from the front of a 4-car train is the third car from the back.
1 1
1
15 11
5