Exactly One Failed Subject

Problem Description

Given a student's Chinese and maths scores, determine whether exactly one of the two subjects is a failing grade (score less than 60).

Input Format

One line containing two integers between 0 and 100, the student's Chinese score and maths score, respectively.

Output Format

If exactly one of the two subjects is failing, output 1; otherwise output 0.

Sample Input

50 80

Sample Output

1

Hint

• "Exactly one failing" is the key: both failing is no good, and both passing is no good either.
• Think about how to express "exactly one of two conditions is true" — count how many are true? Or compare whether the two booleans differ?
• Check against the sample: 50 80 → 1.