How to calculate posts number?

I want to achieve something like this:

foreach ( $posts as $post ) {
    if ( $a = $b ) ) {
        // if true +1 to the result;
    } else {
        // if not true -2 to the result;
    }
}

echo 'Your result is X';

How to replace X with the result of a calculation?
How calculation code should look?

Answers:

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Method 1

Do you mean like this

$result = 10;

foreach ( $posts as $post ) {
    if ( $a = $b ) ) {
        $result += 1;
    } else {
        $result -= 2;
    }
}

echo 'Your result is ' . $result;

This is the best I can do with the provided information

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