def make_count(bits, default_count=50):
    """
    Return items count from URL bits if last bit is positive integer.
    
    >>> make_count(['Emacs'])
    50
    >>> make_count(['20'])
    20
    >>> make_count(['бред', '15'])
    15
    """
    count = default_count
    if len(bits) > 0:
        last_bit = bits[len(bits)-1]
        if last_bit.isdigit():
            count = int(last_bit)
    return count