Problems

# City numbers

# City numbers

Determine if the houses with numbers n and m are located on one side of the street.

## Input data

Two numbers n and m (1 ≤ n, m ≤ 100).

## Output data

Print 1 if the houses with numbers n and m are located on one side of the street and 0 otherwise.

## Examples

Input example #1

1 2

Output example #1

0