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Score : $100$ points

Problem Statement

How many integers not less than $A$ and not more than $B$ are there?

Constraints

• $1 \leq A \leq 100$
• $1 \leq B \leq 100$
• $A$ and $B$ are integers.

Input

Input is given from Standard Input in the following format:

$A$ $B$


Output

Print the number of integers not less than $A$ and not more than $B$.

Sample Input 1

2 4


Sample Output 1

3


We have three integers not less than $2$ and not more than $4$: $2$, $3$, $4$, so we should print $3$.

Sample Input 2

10 100


Sample Output 2

91


Sample Input 3

3 2


Sample Output 3

0


We have no integers not less than $3$ and not more than $2$, so we should print $0$.