import task00, argparse

def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("numbers", nargs="+")
    args = parser.parse_args()
    def a_to_f(a):
        try:
            return float(a)
        except:
            return 0
    print('%f' % (task00.suma(map(a_to_f, args.numbers))))

if __name__ == '__main__':
    main()