题目

阅读理解 Electric devices can seem like a “third party” in Some relationships because some partners spent more time on them than with each other. When Amanda Gao, a 26-year-old white collar worker in Beijing, went to a hotpot restaurant with her boyfriend on Friday night several weeks ago, she expected that they would have a good time together. To her disappointment, however, it did not turn out that later. As soon as they were led to their seats and she began to order dishes, he buried himself in his mobile phone. “It seemed that his phone was making its way between us. A date that 1＋3＋32＋…＋399被4除，所得的余数为________．