DIGITS = {'0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9}
    
    def char2num(s):
        return DIGITS[s]
    
    f,e = s.split('.')
    ff = reduce(lambda x, y: x * 10 + y, map(char2num, f))
    ee = reduce(lambda x, y: x * 10 + y, map(char2num, e))/pow(10,len(e))

    return ff+ee