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 Python (3.4.3) (judge verdict: Runtime Error)

h, w = map(int, input().split())
a = [input() for w in range(h)]

for i in range(h)[::-1]:
    if "#" not in a[i]:
        del a[i]
        h -= 1

n = []
for j in range(w):
    m = ["".join(t[j] for t in a)]
    if "#" in m[0]:
        n += m

for k in range(h):
    print("".join(u[k] for u in n))