fn count_factors(n: i64) -> i64 {
    let mut count = 0;
    let mut i = 1i64;
    while i * i < n {
        if n % i == 0 {
            count += 2;
        }
        i += 1;
    }
    if i * i == n {
        count += 1;
    }

    count
}